The Evolution of Snakes

Подписаться 437 тыс.

Просмотров 1,2 млн

50% 1

Snakes evolved from lizards and in the process of evolving to outclass their prey or their competitors, evolved to loose their limbs, and with this, their ability to chase their prey down on legs. But not just this they also lost their claws so it was much harder to kill their prey as well and because of this snake ended up having to develop new hunting strategies. Like killing by constricting, or injecting venom. It is very difficult to think of the advantage of loosing limbs and it seems that snakes have had to work hard to develop new survival strategies to get around this. So why did a group of entirely carnivorous animals evolve to loose their legs?
To support me on Patreon (thank you): / mothlightmedia
To donate to my PayPal (thank you): www.paypal.me/...
To buy merchandise: teespring.com/en-GB/stores/moth-light...
Email: mothlightmedia@outlook.com
If I have used artwork that belongs to you but have neglected to credit it this will just be because I was unable to find one. If this has happened please contact me and I will add a credit. Some Art work has been altered for the purposes of bettering them for video format; these alterations were done independent from the artists who created the original work, so they are not responsible for any inaccuracies that could have occurred with the changes being made.
Sources:
researchportal...
www.tandfonlin...
royalsocietypu...
www.science.or...
researchportal...
mcz.harvard.ed...
www.researchga...
phys.org/news/...

Опубликовано:

30 сен 2024

Ссылка:

Скачать:

Готовим ссылку...

Добавить в:

Мой плейлист

Посмотреть позже

Комментарии : 1,1 тыс.

@douge2697 2 года назад

Snakes aren't the only lineage of legless lizards either, there's also the amphisbaenians, dibamids, legless skinks (with some nearly legless transitional species), legless geckos, the list goes on and they all independently lost their legs. It just keeps happening - there's something about the squamate body plan that really lends itself to leglessness.

@stormevans6897 2 года назад

Omg thank you, I've had a fascination with the subject ever since I caught my first glass lizard and witnessed the confusion on my dad's face. I had no idea that it had evolved so many times in our modern world, like legless geckos, how did I not know about this? Those are so cool btw.

@bramstedt8997 2 года назад

@Atropus Arbaalish you’re thinking of Caecilians

@frikativos 2 года назад

Yes! I'm surprised legless lizards were not mentioned in the video. I have also seen lizards with such teeny tiny legs they can barely use anymore.

@christiancinnabars1402 2 года назад

All legless/tiny legged reptiles are ones that ended up with very long bodies. My guess is that they all independently evolved to become longer for various reasons, and as a result their legs started to help less and less with locomotion. Being not as useful anymore, their legs slowly grew smaller over generations, then became vestigial and, in some species, eventually disappeared.

@theperfectbotsteve4916 2 года назад

Snakes aren’t technically lizards

@mike-0451 2 года назад

The snakes lost the evolutionary arms race and the legs race, I think.

@TheBurningWarrior 2 года назад

This Just in, Ian.

@slashr406 Год назад

☠☠☠☠☠

@piuscalvinus Год назад

@@TheBurningWarrior See what you did there.

@amenawonotaigbe716 Год назад

You win the internet today 🤣🤣

@brainphelps1994 Год назад

lol you don't even know what you just said!!!

@thomast7794 2 года назад

Same story for turtles. Adaptations for water are useful for burying and vice versa, therefore it's unknown where they evolved.

@Illlium 2 года назад

Poor snakes, they just wanted to chill in the ground and other species railroaded them into a genetic bottleneck. Nature really is cruel.

@kennethsatria6607 2 года назад

@Atropus Arbaalish There are also big ribbed and shelled reptiles that lived marine lives it blurs the lines.

@Ponera86 2 года назад

we actually have a pretty good idea about turtle evolution now. Pappochelys looks to have expanded its chest region and ribs to help with digging. Then you get the first aquatic turtles in china which had only a plastron, which exapted the adaptation.

@mickwayne3398 2 года назад

in other video he says they evolved from marine plesiosaurs

@Paladinpal 2 года назад

I think it's more likely they pursued prey into their burrows like weasels who have undergone a similar evolutionary path. Losing claws won't make you a better digger; losing limbs and slithering does help pursue small prey items into their own burrows, however.

@Her_Viscera 2 года назад

Yeah I really think he should do another pass over the script bc this video was full of that kind of language

@archdornan4389 2 года назад

This means there will eventually be a mammalian weaselsnake that will probably be venomous...

@julianshepherd2038 Год назад

@@archdornan4389 who will be elected US president

@IXSuperRadGamerXI Год назад

@@julianshepherd2038 Or any world leader in the top 5

@lalehiandeity1649 Год назад

@@julianshepherd2038 Please keep politics out of everything that isn’t politics.

@l4430 2 года назад

Something related to this that interests me is how there's no known limbless mammals or birds throughout history. Seeing how prominent the loss of limbs is in non-avian reptilian and ,lesser so, in amphibian evolution, it seems crazy that it hasn't occured even once in mammals or birds. Is this due to the method of locomotion where the lateral movements of lizards etc just allows for limbless movement better whilst that of other groups does not?? I haven't researched this at all and am just piecing together knowledge from my general studies as a zoology student, so I'd love to hear anyone better educated on the matter give input on this!

@fannyalbi9040 2 года назад

because mammals and birds don’t swim zigzag in water, they move their spine up and down, it is impossible to move that way on land unless u r spineless caterpillar 🐛

@IchCharacter 2 года назад

Most mammals and birds don't have the bone structure for it. The closest you'd get might be weasels and moles, but there'd be more problems without limbs. For example their skin/feathers/fur, which are usually too soft. Most animals have especially tough skin on their feet/paws, but other skin would get chafed by being in contact with the ground, especially the usually much softer stomach area of mammals needed for breast-feeding. Mammals and birds had pretty different different ways of getting food (often omnivores), hiding and so on, another reason why they need their limbs. One of their biggest advantages was their resistance to cold, due to their fur/feathers and lack of contact with the ground. Finally, also regarding temperature, almost all mammals/birds are warm-blooded, by constantly exposing a lot of skin to the ground they'd waste tons of energy just to keep warm, it's like turning on the heater while leaving the windows open. Fur/feathers isolate air very well, making it easy to keep their body temperature stable, even if it gets quite cold. By sliding around on the floor, their weight would press out the air and they'd lose a lot of warmth to the ground. This is probably the biggest reason why mammals and birds have limbs, to keep their warm bodies away from the cold ground.

@juanjoyaborja.3054 2 года назад

Odontocetes and Mysticites have lost their hind legs, however, they still need their front limbs for propulsion. The closest mammals to a snake-like body plan are likely mustelids, and yet losing limbs permanently would be a downgrade. For birds, look at their bones. Their bones are pneumatic, hollow, making it hard for a slithery body.

@AuliaAF 2 года назад

@@juanjoyaborja.3054 T-rex almost lose their hands, though. Although it's not for burrowing or slithering, there are also possible situations where bird-like animal prefers aerodynamic shape to free-moving limbs. But then again, rather than losing their hands, birds prefer to change it to wings.

@Johnnybomb1 2 года назад

I think it partially has something to do with the fact that birds and mammals are both endothermic, and reptiles are not.

@tetryds 2 года назад

This is by far the best evolution channel I have ever watched. The fact that you don't waste more time than needed talking about classification and that you go around different evolutionary aspects of a given type of animal makes your videos fulfilling and really entertaining.

@Epidombe 2 года назад

Yes. Every time I recommend the channel I make this point. Theres no persuasion “this discovery changed the course of history forever.”

@o_o8203 2 года назад

Frankenscience has great evolution videos too! Short and to-the-point.

@OdinComposer 2 года назад

And the chill vibe

@danielrusso4468 2 года назад

If you like this you should also check out PBS Eons :)

@tetryds 2 года назад

@@danielrusso4468 What I did not like about PBS Eons is that on the videos I watched it felt like they were discussing classification rather than trying to picture an evolutionary pathway

@mothlightmedia1936 2 года назад

In the video I mentioned that snakes and venomous lizards may have evolved from the same venomous ancestor, however, newer research has challenged this theory and it may not be correct any more: link.springer.com/referenceworkentry/10.1007/978-94-007-6727-0_4-1?noAccess=true

@michaelanderson7715 2 года назад

1:40 "nearly all venomous snakes produce venom to at least a certain extent" - talk about a contradiction! - ALL venomous snakes produce venom, the clue is the word 'venomous', NOT 'nearly' all!

@b.a.erlebacher1139 2 года назад

@@michaelanderson7715 It's a tautology, not a contradiction. Most people make the occasional slip of the tongue. Don't you?

@michaelanderson7715 2 года назад

@@b.a.erlebacher1139 "It's a tautology, not a contradiction. Most people make the occasional slip of the tongue. Don't you?" - I have zero interest in your defensive posture towards the original statement, other than to say, it's irrelevant to my pointing out the flaw within it -------------------------------- I will take up on your tautology 'correction'; "nearly all venomous snakes produce venom to at least a certain extent". - a tautology is a statement that is necessarily true. Applying this to "nearly all venomous snakes produce venom to at least a certain extent", one sees immediately that not only is it not necessarily true, but that it is actually not a logical statement at all and is indeed false. The false part is 'nearly all'. - ALL venomous snakes produce venom (THIS statement IS a tautology!), not 'nearly all'. A contradiction is a statement that is necessarily false. And "nearly all venomous snakes produce venom to at least a certain extent" is false. A true statement would be without 'nearly'. ---------------- Now, your snarky attitude means I've no interest in you further. Muted

@b.a.erlebacher1139 2 года назад

@@michaelanderson7715 Well, I guess you are an expert on snark. These videos are made by a human being. They take a fair bit of work. They are free for everyone to enjoy. I don't expect everyone to be perfect all the time. If you do, you will be constantly disappointed, but I guess it's your way of feeling superior without needing to do anything real to justify it.

@shaymich2395 2 года назад

Question about the evolution of venom from salivary glands: Is it possible that the slight salivary mutation was selected for due to another benefit caused by the same mutation? For example, if all of the lizards fluids were slightly toxic, could bad taste have protected from predation, meaning being venomous would have evolved alongside being poisonous, then either venom or poison lost in certain lineages later on? Alternatively, what if slight toxicity in sperm protected from cloaca bacteria, causing strong sexual selection, and toxic saliva was triggered by the same gene mutation? Do you think any of these scenerios are possible?

@hehehehaheheheha9422 2 года назад

🐍

@origaminosferatu3357 2 года назад

Fascinating! Snakes may be one of those rare occasions where something that is incredibly specialised has enough other useful traits that it ends up diversifying and becoming more generalised.

@jeromewoods6175 2 года назад

Okay MyVirginMedia yyeah y

@Q--_--90909 Год назад

Yes I love snakes for that reason

@mariastevens6406 2 года назад

Just when my anxiety kicks in. Love snakes, and your calming voice. Just in time lol

@sagaramskp 2 года назад

Relatable. Watched in small window when anxiety kicks esp when moray eel was shown

@shinobi-no-bueno 2 года назад

Snakes calming your anxiety sounds like the origin of a supervillain

@mariastevens6406 2 года назад

@@shinobi-no-bueno they don't calm it. I like them so that part doesn't bother me. But if they did, so what?

@ArtsiProductions 2 года назад

Relate-

@Gildedmuse 2 года назад

Nature and History RU-vidrs get me through my kidney disease pain (and they anxiety that it causes; I mean, good for people who deal with terrible pain by becoming better people but personally I just freak out.

@frostyglass3738 2 года назад

Lovely, I didn't know there were snake fossils with tiny legs.

@zenebean 2 года назад

Some modern snakes still have slight suggestions of where their back legs used to be. There is something so cursed about seeing prehistoric ones with little baby baby legs just kinda hanging out there

@l_donoman_l 2 года назад

The danger noodle 🐍🐍

@PonderingStudent 2 года назад

Species of lizards that evolved leglessness more recently (like slow worms and sheltopusiks) are pretty much universally burrowers. Either in soil or in media like dense undergrowth or the cracks in stone walls etc. So snakes starting out as burrowers is by no means a unique evolutionary scenario.

@johnscanlon8467 Год назад

Slow worms and Scheltopusiks are about the LEAST burrowing-adapted examples of elongate limbless reptiles you could have picked. They may capture prey within the prey's burrows, but don't dig their own (see also Pygopus, Delma, Lialis etc among pygopodid limbless geckoes). There are more specialised burrowers in Anguoidea (e.g. Anniella) and Pygopodidae (e.g. Aprasia), but the most basal lineages in both families are active on the surface. So snakes starting out as surface-active probing foragers would by no means be a unique scenario either.

@SwampApeSci 2 года назад

Venom injection and constricting are such interesting specialized hunting strategies but there's a few snakes that have just gone back on the 'ol tried and true method of just thrash and maul prey to death. Like the Drymarchon and Masticophis

@specific3600 2 года назад

“Nearly all venomous snakes produce venom to at least a certain extent” ah yes, the floor here seems to be made out of floor Jokes aside, great video. Love snakes ^-^

@FreedomAnderson 2 года назад

Some venomous species such as Garter and Hognose Snakes are rear fanged and have more of a toxic saliva than true venom.

@michaelanderson7715 2 года назад

Your sarcasm fails to address the _actual_ flaw in the statement! - ALL venomous snakes produce venom, the clue is the word 'venomous', not 'nearly' all! Your comment addresses "all venomous snakes produce venom to at least a certain extent", a statement NOT made

@bkjeong4302 2 года назад

Cladistically, snakes are lizards-the most successful lineage of legless lizards ever.

@dinotyrannus 2 года назад

All squamates technically are lizards and the reason why snakes are excluded from lizards appears to be arbitrary as there are lizards more closely related to snakes than to another squamate that are considered lizards

@jessehunter362 Год назад

@@dinotyrannus snakes aren’t excluded from lizards in most taxonomies. They are just the third group of legless lizards, and are very morphologically diverse and distinct.

@dinotyrannus Год назад

@@jessehunter362 though most people and even scientific articles doesn't consider them as lizards and snakes are just seen as a relative of lizards, yes snakes are just one of the many lineages of legless lizards and are therefore a type of lizard

@ricolibrando8716 2 года назад

Evolution of chickens plsss ☺️

@val-schaeffer1117 2 года назад

I just got to know my mother-in-law, little better.

@jessehunter362 2 года назад

The single-origin venom hypothesis isn’t the only one, a lot of the animals which have “reduced venom” don’t use their venom-related proteins as a venom. Limblessness evolved several times in lizards, most often preluded by rib duplication, and it’s quite possible venom has evolved multiple times from the genes which encode the venom-related proteins.

@lastEvergreen 2 года назад

Best animal channel in the game

@AlmedaRen 2 года назад

Yup

@optillian4182 2 года назад

There are people today who believe snakes' legs were taken away by a magic man in the sky. It's sad.

@Thewildlifeenthusiast123 2 года назад

How can najash and any prehistoric snakes with legs coexist with humans :/

@pablito8568 Год назад

Actually its vary stupid

@pablito8568 Год назад

And sad too

@LiveActiveCultures 2 года назад

I’d love to see an evolution of chickens video. With over 20 billion of them on the planet, and our symbiotic relationship, I’m sure people would love to see how the common clucker came to be

@rickkwitkoski1976 2 года назад

The southeast Asian jungle fowl is known to be where modern domestic chickens came from. Domestic breeding had changed them a LOT Even in the past 50 years, meat chickens have more than doubled in size.

@Sathish_12 2 года назад

t-rex became chicken

@user-lu6yg3vk9z Год назад

@@rickkwitkoski1976 doubled in size from hormone injection

@robrice7246 2 года назад

I know there was a recent article that came out regarding snake evolution and the K-Pg extinction.

@spyrofrost9158 2 года назад

1:43 "But actually, nearly all venomous snakes produce venom to at least a certain extent." Well, can't argue with that one.

@michaelanderson7715 2 года назад

" "But actually, nearly all venomous snakes produce venom to at least a certain extent." Well, can't argue with that one." - well, you've failed miserably then, as it's contradictory nonsense! - ALL venomous snakes produce venom, the clue is the word 'venomous', NOT 'nearly' all!

@omarb7164 2 года назад

@@michaelanderson7715 no shit

@michaelanderson7715 2 года назад

@@omarb7164 I think you missed the point, not that I care, you foul bucket of vomit; muted.

@jayteah1349 2 года назад

If you go by the logic of Spore: Snakes sold off legs for to buy venom.

@UniDocs_Mahapushpa_Cyavana 2 года назад

Monitor lizards are very good burrowers and since snakes often live underground and burrowing animals seem universally good at swimming, mosasaurs would be primed for aquatic life, even if solely terrestrial close to evolving.

@emmanuelsanchez9303 2 года назад

I'm a little bummed out that there was no mention of Titanoboa. I have no idea how that fits into snake evolution, but still, it would have been cool to hear a shout out to the most massive known snake that has ever lived 🐍🐍

@griffinhunter3206 2 года назад

I do feel like you could have mentioned how many lizards on land have reduced or lost their legs as well

@griffinhunter3206 2 года назад

@@sqrt2295 Skinks even do a sort of slither *with limbs*

@UniDocs_Mahapushpa_Cyavana 2 года назад

It is pretty much "they got better at underground life" (with simple tunnels and using the tunnels of others)" each time.

@griffinhunter3206 2 года назад

@@UniDocs_Mahapushpa_Cyavana Thats not wholly true, sand swimming is a fascinating and similar reason for lizards developing leglessness a lot. Its not true tunneling behavior because there is no tunnel, its just vibing in an enclosed sandly space. THere are also certain advantages for movement through thick brush or other low plant environments, though i cannot say if this actually shaped lizards to leglesness

@UniDocs_Mahapushpa_Cyavana 2 года назад

@@griffinhunter3206Being snakes they usually just make/find a small tunnel and stand there for hours on end maximising their extremely low energy usage thing they have going. Snakes don't eat a lot, which is probably why the Bible says they eat dirt, because no one saw them eat meat, especially with their inability to chew. Also, they probably thought earthworms were baby snakes. Apparently, they were not aware of what sea cucumbers eat; one of the reasons why the curse on snakes makes no sense.

@griffinhunter3206 2 года назад

@@UniDocs_Mahapushpa_Cyavana Worm/vermin both come from a word which meant snake. Also theres no difference between a snake and any other sort of legless lizard in most anchient people's minds. I personally would not mind if we decided to call all the legless lizards snakes.

@dark_antihero 2 года назад

Imagine the prehistoric snakes with the tiny legs actually decided to use them

@ExtremeMadnessX 2 года назад

There's lizards with tiny legs.

@fordprefect80 2 года назад

In Australia we have a species of legless lizard called Pygopodidae. I've found them in the garden on the odd occasion.

@b.a.erlebacher1139 2 года назад

Pygopods are technically a subgroup of geckos. You Australians have so many cool animals.

@aadhiablink9469 Год назад

@@b.a.erlebacher1139 nature chose australia

@Scaling_Obsession 2 года назад

I like snakes. 🐍

@jamesbentonticer4706 2 года назад

So do we know if they evolved for aquatic life then came back on land or lost their limbs on land then became aquatic?

@zebedeemadness2672 2 года назад

At present it's either, or, we don't have enough info to say either way, but the fact we have legless lizard, that didn't come from Aquatic living ancestry, they came from land burrowing lizards, it's just as likely snake evolved the same way, we haven't got that needed ancestor yet, to tell us for sure, both ways of evolution are plausible.

@jamesbentonticer4706 2 года назад

@@zebedeemadness2672 excellent. Thank you for clearing that up for me. I like your explanation.

@Uniqueusername2 2 года назад

Oh hell yeah

@UniDocs_Mahapushpa_Cyavana 2 года назад

Limbless squamates have evolved 7+ times, with multiple big groups, so clearly that plan just works. Snakes are unique in that they also cannot chew AFAIK, except for one snake that broke the mold.

@jessehunter362 2 года назад

And that a lot of them have protrusible jaws!

@osiris654 2 года назад

AFAIK?

@jessehunter362 2 года назад

@@osiris654 as far as i know

@UniDocs_Mahapushpa_Cyavana 2 года назад

@@osiris654 As far as I know.

@BruceWaynesaysLandBack 2 года назад

I think the word “primitive” needs to be phased out in discussions like this. Gila Monsters have their own approach to poisoning prey- it’s not more/less ‘primitive’ than venomous snake fangs. Jellyfish are very similar to the first multicellular life to ever exist- is everything else “primitive” for not copying their success?🙄

@fleetskipper1810 2 года назад

Agreed. The word “primitive” is loaded with connotation that doesn’t really fit into a discussion of Evolutionary paths. Some succeed, some don’t.

@UniDocs_Mahapushpa_Cyavana 2 года назад

Their best power is making Genesis not make any sense at all.

@alixsprallix 2 года назад

Yay new video

@arcade8706 2 года назад

I AUDIBLY SCREAMED WHEN I SAW THE NOTIF I AM SO EXCITED

@guardianoffire8814 2 года назад

Like a little girl...

@arcade8706 2 года назад

@@guardianoffire8814 WHSHGEHEHEV??? im a man

@crazydrummer181 Год назад

Neat fact: Ball Pythons have claws!

@Funkiotologist 2 года назад

I have always wished we knew more about snakes evolution and sharks. We can only kinda speculate for many but in a way makes it more intriguing. I remember when Aquilamna was found in 2020 it blew my mind as to see a preserved shark fossil nonetheless one that had modified wing like fins was awe-inspiring

@godfreyofbouillon966 2 года назад

I think when you say "known since Darwin's time" it's probably more like "correctly guessed at Darwin's time". Since they had no genetics and body morphology was probably all they were going by, and that can be extremely deceiving. Although of course they were aware of convergent evolution, still, determining evolution links was damn hard job back then.

@therealzilch Год назад

Another typically informative and charming lesson, thanks. The importance of gene duplication for evolution, at all levels, including the whole genome, cannot be overstated: it's fundamental. Other examples (as I'm sure you know) are our color vision and blood types. Creationists often argue that the information in a genome cannot increase through evolution, but that's because they don't recognize duplication and subsequent evolution of new alleles. cheers from sunny Vienna, Scott

@Infernoraptor 2 года назад

RE: Uatchitodon, how do they know it was still a lizard instead of a stem-snake if they only have teeth from it? Or was the lizard otherwise completely unrelated to the toxicofera line and just showed what the evolution of injecting fangs looked like in another lineage? Interesting and well done as always.

@sterlingmuse5808 2 года назад

I thought he was saying it was only 4 teeth as in "a total of 4 teeth on the animal" instead of "only teeth have been found"

@jessehunter362 2 года назад

We know it only from teeth, and it’s probable that it’s an archosauromorph

@jessehunter362 2 года назад

@Jesse Mathis We know for certain that snakes in the strict sense don’t go back so far. Tooth morphology matches best with archosauromorphs. We do not have anything close to the insane record of shark teeth that allows us to make strong inferences about shark lineage and morphology based exclusively on their teeth, but we do have enough archosauromorph teeth that we can determine it is most likely an archosauromorph. They are in a state of evolution between teeth used for chewing venom and injecting venom, are the only teeth of a venomous animal that we have at that point. The particular nature of their cladistics is irrelevant to their use as a tool for understanding snake venom evolution.

@jessehunter362 2 года назад

@Jesse Mathis for more information check doi:10.1007/s00114-010-0729-0

@stormevans6897 2 года назад

It blows my mind how effective fangs are, that they so happened to pop up over and over again. Videos like these remind me why I use evolutionary biology to explain just about everything in living things.

@bakionigeri6414 Год назад

Because it's, in my opinion I should probably say, the only real answer to anything. Not to go there LOL but look at dating; it can be quite confusing why people choose who they choose, until you look at reproductive Health in women, and protect and provide for everybody ability in men. It's the only time it becomes clear.

@RambolifeCheesblocks 2 года назад

FYI, only about one seventh of venomous snake species have hollow injector fangs. Some species don't even have venom guiding grooves along their fangs.

@GabrielLima-zo3fj 2 года назад

great video, thank you! but why do they have the silly tongues

@rickkwitkoski1976 2 года назад

The forked tongue is used to "taste" the air. More correctly to smell it. As detected molecules flow by the tongue, the snake can determine the direction they came from. Very similar to how two ears can give you stereo hearing and, therefore, directionality of sound and two ears can give you depth of field in vision.

@GabrielLima-zo3fj 2 года назад

@@rickkwitkoski1976 amazing

@bluetannery1527 2 года назад

It's fascinating that the snake body plan works as well as it does, but the transition is so fuzzy. it's like, a snake body plan works great, but to be able to develop it gradually from a lizard body plan, you need very specific circumstances and environmental pressures. So once you beat the odds, suddenly snakes (in the completed transition form) are super capable of being super diverse. They got so specialized that they accidentally evolved a super customizable body plan capable of huge diversity

@Spikklubba 2 года назад

Reminds me of the old "what good is half a wing"-thing about bird evolution before archeopteryx and the like.

@NotSoSerious69420 2 года назад

It just seems that the pressure to be able to burrow leads to losing limbs to be better at doing it. Having limbs doesn’t mean you can’t burrow well but not having them means you can just burrow better.

@sakesaurus 2 года назад

what's the name of the lizard that evolved to have closed canals with venom? you gargled the name and it's impossible to google

@LangThoughts 2 года назад

The j in Najash is pronounced as in Spanish, since the name comes from the Hebrew word for snake "Nakhash", thus Na-hash, not Na-jash.

@Devo491 2 года назад

'Loose' means 'not tight'. I think 'lose', meaning misplace, or be deprived of, is the word you're looking for.

@A113-p9e 2 года назад

The long bois

@elgringo1893 2 года назад

Legless-ness has occured multiple times, independently in lizards which indicates that there must be something about lizards that causes them to benefit from a legless body plan. We even have the slow worm in the UK which is a legless lizard and not a true snake. It does seem to only happen with carnivorous lizards though so maybe the ability to squeeze into smaller gaps in order to find hiding insects just pushes lizards to this evolutionary pathway? Could it be something to do with them being basking animals trying to compete for niches with other larger basking animals? It's really interesting that we don't see this evolutionary trope in mammals or other groups of land animals, just lizards, possibly something to do with lizards having their hips pointing their limbs out sideways instead of beneath them. Would love to here an expert opinion on this.

@joeshmoe8345 2 года назад

Great video, thanks for sharing boss!

@lassebirkhenriksen 2 года назад

I have some suggestions for future evolution videos: Evolution of: Chickens Sheeps Rabbits Moles Sharks Ducks Lungfish (Mudskippers) Mushrooms Sponges

@UniDocs_Mahapushpa_Cyavana 2 года назад

Mudskippers are unrelated to lungfish being ray-finned fish. If you are talking about walking fish in general there are many to choose from and they are all pretty cool.

@vikorovstock2432 2 года назад

Aren't Sponges some of the oldest animals around? A video describing the ways they changed throughout the millions of year would be interesting.

@lassebirkhenriksen 2 года назад

@@vikorovstock2432 exactly

@UniDocs_Mahapushpa_Cyavana 2 года назад

@@vikorovstock2432 Their larvae would probably be the main focus. It probably shows how they relate to other animals through neoteny and transitional forms. Good too, you don't hear much about any larval form, and basically nothing about sponge larvae.

@michaelanderson7715 2 года назад

Just don't spew out the "chickens are the closest living T. rex relative", it's NONSENSE.

@kilpatrickkirksimmons5016 2 года назад

I heard that as "Sicilians, which are a group of amphibians...." and had an old-school racist chuckle to myself. I expect Christopher Walken to shoot me in the face any minute now.

@mothies2260 2 года назад

Evolution of moth?

@galloe8933 2 года назад

Years, and years ago when I was a child, a gecko bit my sister because she tried to touch one in the barn. She was 8, I was 5, so very young but I still remember how sausage like her fingers were.

@brucelee5576 2 года назад

They could have lost them partly to defensive reasons as well , without limbs you can sneak in to small spaces like holes made by other animals.

@magichands135 2 года назад

Why actually, are snakes not affected by their own venom?

@alexthejaewd 2 года назад

They will often have protines or other molocules that counteract the venom, or are resistant to it. iirc they also dont always inject venom when they bite, (dry strikes) and only release the venom when theyre sure theyre biting the right thing. So i imagine its rareish for them to accedently inject venom into themselves

@danielfreezer8469 2 года назад

@@alexthejaewd Viperids and elapids, it is argued, have this control to release venom, but they don't only release venom to attack prey obviously. The bioga and other venomous colubrids though, they have a duvernoy's gland which is kinda "random" at releasing. Either way, snakes are not affected by the venom they produce. If a king cobra bites a king cobra, it doesn't matter. However, if a diamondback bites a copperhead, the copperhead will be affected. Different venom.

@anon9579 2 года назад

Evolution of crabs next please

@rickkwitkoski1976 2 года назад

The crab form has arisen several times. There are "true" crabs and then some other groups with a similar body plan. Convergent Evolution. This is similar to how tuna, sharks, dolphins, ichthyosaurs are converged on a similar body shape for similar reasons. But your suggestion would be an interesting exploration

@heilmadon 2 года назад

Id like to think part of the reason they became legless was to allow their ability to swallow things much bigger than their mouths.

@NotSoSerious69420 2 года назад

That doesn’t have much to do with the other though does it? Aren’t there other lizard/reptiles with non connected jaws (and thus possibly able to eat things bigger than their heads)? Also if that was the evolutionary pressure for them to lose their legs then they would’ve had to have already been able to do it to some degree before they lost them anyway. Seems being able to burrow is the most common trait between all legless reptiles/lizards.

@heilmadon 2 года назад

@@NotSoSerious69420 Hear me out while yes the unhinging of the jaw Allowes for swallowing of larger prey there is another part of the body that creates a choke point. The ribcage and collarbone having to use their limbs would need these structures to support them and still lImit the size of their food intake. I am not saying it was the main drive but I feel there could have been a selective pressure with allowing them to consume larger prey that also played the part in developing limblessness. The front limbs did go first after all.

@jessehunter362 Год назад

@@heilmadon The most basal snakes, fully limbless and still alive today, don’t have the jaw changes that allow them to eat large prey.

@hughbrandreth5637 2 года назад

I have read that terrestrial snakes smell by wafting their tongues in the air and then resting them against their nostrils inside their mouths. Aquatic animals like cetaceans close their nostrils when submerged, so they cannot smell their surroundings. Could the snakes' use of their tongues to smell be an adaptation to overcome this problem, suggesting that they have an aquatic ancestor?

@UniDocs_Mahapushpa_Cyavana 2 года назад

It is their Jacobson's organ. It is different from the nostrils, and detects different smells. By the way, it basically means most tetrapods, including domestic ones, are bisexual if they want to be, as it is how they tend to differentiate gender. They can just close their moth to avoid being repulsed.

@chuchu9649 2 года назад

Liking the new editing style with the stock footage.

@philbydoodle6199 2 года назад

Evolution is fascinating

@gregoryt8792 2 года назад

If Darwin was alive today he would not have even proposed such a ridiculous theory.

@gavinwiebe6613 2 года назад

snakes evolved from lizards? snakes **are** lizards B)

@kindalost2495 2 года назад

Limbs are overrated..

@shinobi-no-bueno 2 года назад

I love the idea of a big ol snake slithering up and around a dead tree, coiling around it and then these stumpy little legs furiously scrabbling as the tail wraps around

@Desklamp1234 2 года назад

i never knew my EX has such a long lineage

@sickenedwired1934 2 года назад

We have salamanders today that are going through a very similar process.

@williampulfer-melville8536 2 года назад

Please make a video on the evolution of hedgehogs

@truesheltopusik1140 2 года назад

Just intresting fact i guess, but snakes are not the only land reptiles that lost their legs, lizards have lost their legs on separate occasions as well, to make things like glass lizards and slow worms.

@sassa82 2 года назад

Great video. Time for me to relax!

@Goudhaantje1993 2 года назад

Watching your videos is basically therapy. Also very informative.

@GoingGreenification 2 года назад

Evolutionary arms race lol

@dogeclark2265 2 года назад

Hell yes Mothlight time

@tylerball665 Год назад

If the narrator was a snake I’d let him constrict me to death as long he kept on narrating. So relaxing.

@Aurora666_yt Год назад

Ikr 🤣

@klonik79 2 года назад

Twice. Slowworms are on same evolution path, and on outside they look like snakes.

@UniDocs_Mahapushpa_Cyavana 2 года назад

Slowworms still have enough teeth for chewing. So other than being one of the 7+ lineages of legless squamates they are probably not going to fill many of the snake niches. The large group Amphisbaenida takes up many niches that snakes do not fill (being unable to chew), so really snakes are unique in the legless squamate club. They all seem to be good at swimming though.

@akiraasmr3002 2 года назад

can you do a video on evolution of dinocephalians like anteosaurus who was a bigger predator than gorgonopsid and it looked scarier as well.

@pavelmorozov6599 5 месяцев назад

so when did the snake evolve that scammed adam and eve ? 🤣🤣

@spatrk6634 Месяц назад

i dont know. but apparently that snake had legs when it scammed adam and eve.

@Zsy6 2 года назад

When I saw this pop up in my subscriptions feed I literally said "Aw, hell yeah!"

@striderwhiston9897 2 года назад

Snakes are still technically legless lizards

@jasonjohnson1404 2 года назад

Just to add a clarifying comment. Moth Light mentions a "genetic bottleneck". This is not the same thing as an evolutionary bottleneck, though both affect the genetic makeup of populations. An evolutionary bottleneck involves a chance event skewing the genetics of a group (like a hurricane or other cataclysmic event). A genetic bottleneck is one where the path of natural selection eliminates traits that would otherwise be useful and then later on the group radiates out, but has lost traits (like limbs).

@omarb7164 2 года назад

Thanks for pointing that out. So it’s a bottleneck in the sense that the trait of having limbs is officially lost, and unlikely to ever appear in species evolved following the bottleneck?

@hatusnee 2 года назад

Noodle babies

@harleyjudy2850 2 года назад

praise be the rutern of of moth light

@mechwarrior13 2 года назад

Thanks for continuing the story of life on this channel, i prefer quality over quantity any day!

@Major00Tom 2 года назад

Let me get this straight.. So you like biology books AND detective books too? Fascinating...

@kuitaranheatmorus9932 2 года назад

I love the evolution of many animals but this is amazing

@oj7442 2 года назад

Love your videos but wheres the old background music? It made the long past ecosystems have an almost dreamlike otherworldly vibe

@lassebirkhenriksen 2 года назад

thank for doing this video. it was me who requested it

@tristancoetzee6059 2 года назад

then thanks for requesting it :D

@antwan1357 2 года назад

I was actually hoping for a snake like convergent evolution examples of animals that all look like snakes but genetically separate.

@quinndenver4075 2 года назад

Unparalleled content 👍

@cacogenicist 2 года назад

Snake bodies: there's a reliable supply of food in holes.

@demos113 2 года назад

Very interesting. 🙂

@connorpratt4874 2 года назад

Maturing is realizing moth light media is far superior to pbs eons

@jorgerangel2390 2 года назад

Quality content, as always

@luutas Год назад

Snakes can go in holes that are exactly their diameter. No animal with legs can do that. It's an extreme advantage. You can catch more prey and also hide better when in danger. Both those things are enough to select a new species