How These Animals Lost Their Heads (And Bodies, and Butts)

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You'd think that there are some features that, once an animal group evolved to have them, could never really go away, right? Well, Stefan is joined today by hosts from PBS Eons, Journey To The Microcosmos, and Bizarre Beasts to break down just how wrong that is! And yes, we will be talking about tardigrades.
Eons: / @eons
Journey to the Microcosmos: / @journeytomicro
Bizarre Beasts: / @bizarrebeasts
Hosted by: Stefan Chin (he/him)
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#SciShow #science #education #learning #complexly
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Sources & Image Sources: drive.google.com/file/d/1k1OP...

Опубликовано:

21 май 2024

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Комментарии : 466

@batuhanguner8103 18 дней назад

...so no head?

@CrypticRite 18 дней назад

[Tartagrades has entered the chat]

@korihor9161 18 дней назад

I understood that reference. *Proceeds to stomp on a skateboard*

@BurntToast95 18 дней назад

I didn't even watch the video, I just ran straight to the comments SPECIFICALLY for this!

@ronaldyang2295 18 дней назад

No head 😢

@mirthenary 18 дней назад

Sometimes you just want to get down to business😉

@adamphilip1623 18 дней назад

I gotta say I'm absolutely loving the refreshed style on scishow, it's great and the slightly longer videos and new hosts are great too!

@brandon8900 18 дней назад

They couldn't stand much longer, now that they have chairs they can do 15 minute episodes 😂

@Foiled_Foliage 18 дней назад

Very much same. Very cool. Much more laid back. Love it.

@nate9221 18 дней назад

It's my favorite clown show

@tomboyadvance011 18 дней назад

same, i love how comfy the new living room background makes the videos look!

@diebesgrab 18 дней назад

I’m happy for the people who are happy, but to be honest, I miss the more frenetic, energetic style.

@brieoconnor9824 18 дней назад

As a geology student, putting the line of symmetry down the middle of the bivalve instead of inbetween the shells hurts me a little bit, because its the main way we distinguish between bivalves and brachiopods

@shanleyshoupe7873 18 дней назад

THANK YOU i was like how did u not split it the most obvious way

@evilsharkey8954 17 дней назад

Especially since scallops are the only ones symmetrical along that axis. Mussels, oysters, and a lot of clams certainly aren’t. Of course, it doesn’t help that oysters and many scallops are not completely symmetrical between the valves, either, at least their shells aren’t.

@ferretyluv 17 дней назад

I mean, brachiopods have holes in the shell. I’d think that’s a pretty easy way to distinguish them.

@ajchapeliere 15 дней назад

Can you explain the geology aspect of your comment? I feel like I'm missing the connection.

@brieoconnor9824 14 дней назад

@@ajchapeliere I'm talking about in fossil specimens (there are much easier ways to tell in living ones), and I know in some other places Palaeontology is considered completely separate, but in the UK its a subset of Geology

@akumaking1 18 дней назад

A lot of people I’ve encountered never really progressed past the early stages of being a deuterostome.

@ArchFundy 18 дней назад

Ya...They are also know as Republicans.

@franimal86 18 дней назад

@ArchFundy Don’t bring politics to Scishow, please!! Even though I agree with you lolll

@accordionbabe 18 дней назад

Some i know are multi-butts!

@nunyabiznez8120 18 дней назад

This coming from a starfish lefty...

@WhoElseButZane 18 дней назад

Huur hurr hurr a joke like that's never made before

@chancemeyers8502 18 дней назад

Im liking the new style guys. The small mix of comedy into the knowledge is not only refreshing, as a science nerd I feel like it helps people who are here learning for the first time feel more comfortable and open to learning. So keep it up guys! Y'all are a great channel.

@falcoskywolf 18 дней назад

What a fun crossover! Seems like Complexly is digging into more complexity with production!

@alveolate 17 дней назад

stefan got comfy on his couch and summoned 3 juniors to take over xD

@halloweendad 18 дней назад

I remember hearing or reading about certain tube worms that have no digestive system. Not even a mouth or anus. They live near volcanic thermal vents and absorb nutrients straight through their skin.

@briceblanchard7460 18 дней назад

😮😮😮😮😮

@rateeightx 16 дней назад

If memory serves, Don't they have bacteria growing within them, that consume the nutrients before being digested by the tube worms?

@halloweendad 15 дней назад

@@rateeightx Close. I looked it up, they don't actually digest the bacteria; they form a symbiosis. The tube worm provides the bacteria hydrogen sulfide and a safe home and in turn the bacteria produces food for the tube worm which, I suppose, just enters the bloodstream. oceanexplorer.noaa.gov/explorations/02mexico/background/tubeworms/tubeworms.html Sometimes real life is stranger than science fiction.

@Langkowski 3 дня назад

There are some other annelids which are missing a digestive system too. The female Osedax lacks a digestive tract, including a mouth, gut, and anus. And the genus Olavius. And some echinoderms called sea daisies (Concentricycloidea).

@DarwinsTable 18 дней назад

Dude, that starfish thumbnail was already great. This headless rhino is just macabre.

@SavageMinnow 18 дней назад

It's likely been both the whole time. RU-vid has a new feature for creators where they can upload two thumbnails and RU-vid will show both of them, depending on which they think that specific user (you) will click on. It can also change between the two if you've not watched the video and the algorithm has updated data that shows similar users responded to the other pic.

@sophierobinson2738 18 дней назад

It reminds me of a cartoon by James Thurber, who was going blind at the time. He was going to draw a sofa with a couple sitting on it but ended up with a rhino with its head turned.

@DarwinsTable 17 дней назад

@@SavageMinnow Good to know.

@AnkhAnanku 17 дней назад

@@sophierobinson2738 this is a tiny part of a person’s story I never would have thought to learn. The world is bafflingly big

@oliviervancantfort5327 18 дней назад

"Multi-armed head" brought back memories of John Carpenter's The Thing. Evolution was a bit faster in this case though.

@kleinerprinz99 17 дней назад

Thats a parasite mutating their host (changing phenotype/ physiology). I would not call it evolution. Also it was a great practical effects horror / thriller movie :D

@4124V4TA-SNPCA-x 17 дней назад

Really? That description brings Krang and Utroms to my mind instantly.

@alveolate 17 дней назад

i was thinking of Davy Jones from the pirates of the caribbean

@nathanlevesque7812 17 дней назад

@@kleinerprinz99 It's shown killing other lifeforms and mimicking them, not infecting hosts. We might speculate that it is a parasitoid though.

@maolcogi 17 дней назад

@@alveolate Did he poop out the top of his head too?

@teresaellis7062 15 дней назад

The wandering head idea reminds me of the one type of vampire which looks human by day, but by night its ears turn into wings and the head flies around looking for a meal.

@chumbucketjones9761 18 дней назад

'Attack of The Ambulatory Head' - In theaters this Summer.

@BionicMilkaholic 18 дней назад

A few years ago I saw an old black and white movie, "The Crawling Eye". It's comedically bad

@sophierobinson2738 18 дней назад

@@BionicMilkaholicThe one with the invisible flying brains got me. (They were visible under certain circumstances.)

@evilsharkey8954 17 дней назад

For a lot of sea creatures, those ambulatory heads are terrifying. Do you know how starfish eat?

@TJtheBee 18 дней назад

I think the number one thing I’ve learned from this episode is that I never want to step into the ocean ever again.

@sophierobinson2738 18 дней назад

Maybe do a little wading, but any farther….No!

@evilsharkey8954 17 дней назад

The deadliest thing in the ocean, by far, is the water.

@paradisepipeco 17 дней назад

@@sophierobinson2738 You hear people argue a lot about row versus wade these days, but I think it all depends on how deep the water is.

@JenivieveSteve 18 дней назад

Loving the recent crossovers on the SciShow main channel. I was unaware there were more than just the SciShow spinoffs under the same company and am glad to know more now :)

@Elijah-eg1xt 5 дней назад

Dude I love PBS eons. They're so cool.

@peterdore2572 18 дней назад

Im glad Scishow can still conjure up Great and Original Videos after so many years! I love to see the hosts interact like that. Very funny 😊

@caniwishformorewishes8654 18 дней назад

I was expecting to see tunicates on the list. They are some of the first chordates diverge from the rest of us. Their larval form is basically a free swimming fish, but when they mature they metamorphosize into basically a sea sponge and lose the ability to move, their heads and limbs, and most of their nervous system.

@turkoositerapsidi 13 дней назад

I was thinking about that too.

@artiumromanov9798 18 дней назад

The new format is wayyy more entertaining, may the algorithm gods bless Scishow!

@feynthefallen 16 дней назад

I always assumed that molluscs _with_ heads and molluscs _without_ heads evolved from a common, headless ancestor. Learn something new every day.

@diproton 18 дней назад

in re. tardigrades and minified body plans, parasitic wasps (megaphragma mymaripenne, for instance) have impressively /scrunched themselves down/

@Cinderpelt1002 18 дней назад

I already knew that echinoderms are deuterostomes, but it's still wild to me that we have more in common with them (evolutionarily) than we do with insects.

@Dreamheart101 2 дня назад

Dang evolution, tricking us once again

@kyt-nh1ef 18 дней назад

I enjoyed and would love to see more episodes of Bizarre Sci Cosmo Eon Show

@kashiichan 18 дней назад

@AceAlbatros 18 дней назад

6:15 never seen that in my life but immediately makes sense that’s the water bears cousin with his cute little feet.

@jameskoomler3255 18 дней назад

Stefan's acting in this was great. The personality in the script is also really good and refreshing.

@crisdekker8223 18 дней назад

A curse upon your thumbnail!

@KY_CPA 18 дней назад

I love this collaboration so much ❣️ We definitely need more mashups between the completely channels!

@Nee96Nee 18 дней назад

It is so sad that this is the last year of Journy to the Microcosmos.

@therationalhuman9874 18 дней назад

Seriously? Why?

@phionella7 18 дней назад

Im really enjoying the laid-back atmosphere at scishow and todays episode was an awesome collab of 4 of the best channels. ❤

@theEevee098 18 дней назад

I'm going to accept this as my most-wanted Bizarre Beasts episode for tardigrades

@MandrakeFernflower 18 дней назад

it's the cambrian explosion

@chrysolite2842 10 дней назад

The sun is a deadly lazer

@maximilianmorse9697 18 дней назад

6:09 aww why is it so cute

@feynthefallen 16 дней назад

Each of your videos generally prompts a flurry of wikipedia-browsing in me, leading me off on many diverse tangents and fascinating side quests. And people wonder why my head is stuffed with the most obscure and esoteric knowledge from all kinds of disciplines...

@gillablecam 18 дней назад

I've never had such a strong feeling of joy accompanied by such a strong thought of "these guys are dorks," please never change, it's delightful

@aeroscorpian 18 дней назад

Loved this collab (and the newer change in content format in general). I didn't know about all of those sister channels, so I love being introduced to more amazing content.

@seantierney6361 18 дней назад

So no head?

@NecoBridge 18 дней назад

*breaks skateboard*

@therationalhuman9874 18 дней назад

Good to see Eons here! A big fan of it! Also good to see a Collab between some of my favorite channels!

@dabidoak 18 дней назад

4:07 Oh wow I never knew about those eyes. That's strangely terrifying to me.

@joshuahillerup4290 18 дней назад

I know there's debates about where sponges fit into the animal tree, where depending on what's right could mean that sponges lost a *lot*

@falsificationism 18 дней назад

I can't believe they chose this grotesque thumbnail over the starfish.

@Caracal-lm6es 18 дней назад

"Being a bivalve sounds pretty chill." Yea, until you find yourself at THE OYSTER BAR!

@turkoositerapsidi 13 дней назад

Doesn't mermaids eat them too?

@DominikJaniec 18 дней назад

great colab! very interesting stuff, thank you :)

@sharkembark4784 18 дней назад

This cross over is so fun!

@nerfworthy218 18 дней назад

These episodes keep getting better and better! Whatever you guys are doing, keep doing it. I LOVE all your channels.

@Investigator86 18 дней назад

Wow, all three are disturbing in the best of ways. Thank you all!!!

@bomafett 18 дней назад

I thought this was going to be about Mike the Headless Chicken.

@tomboyadvance011 18 дней назад

loving the collabs ♡♡ always excited to find a new sister channel to follow!

@nHans 17 дней назад

Kipling: If you can keep your head ... Bivalves: No thanks!

@catebrooks6779 17 дней назад

And now, "happy as a clam" maybe come back in full force!😂🎉 Great crossover!❤

@frohnatur9806 18 дней назад

The most mysterious part of the video was what you mean by an animal losing its body. First I thought: "Are we talking about ghosts now??"

@AidanRatnage 17 дней назад

Same, I still don't know what they meant, they defined a head but not a body.

@frohnatur9806 17 дней назад

@@AidanRatnage I suspect they meant something like torso, rump or upper body, but I'm not entirely certain. And you're right, I didn't even realize they defined what a head is, even though that one is much less ambiguous

@TheSuzberry 18 дней назад

I want four more brains.

@katyowens3119 18 дней назад

What a mash up. All my favorite channels. On one episode 😍

@gmhelwig 18 дней назад

Evolution is all about survival of the sufficiently fit.

@umhi9778 18 дней назад

Survival of the doesn't need to work out.

@Beardqt 18 дней назад

You're right, "how animals lost their bodies" wouldn't sound right, perfect title as always

@lonely-lee 18 дней назад

woahhh i've never been this early to an upload !

@digi_056 16 дней назад

A long time ago I saw a story about a chicken that lost its head and lived a a pet for quite a while

@anthonyaguilar3949 14 дней назад

You know its gonna get crazy when the video starts with a definition of what a head is.

@nariu7times328 18 дней назад

Great show!

@gaeshows1938 17 дней назад

Nice collaboration

@rainbowcat7806 17 дней назад

I was JUST hoping for another PBS Eons episode… and then the crossover happened!!!

@CoughitsKath 16 дней назад

I'm so glad they're finally letting you guys sit down after all those years trapped in the scishow studio

@djlabs00 18 дней назад

Oh hey Kallie, be watching that channel later😂

@aronbakker4014 16 дней назад

Really like that the sister channels get to have a get together to feature in one video, getting some of the attention they deserve as well.

@cuckoophendula8211 18 дней назад

(eagerly raises hand) Ooh ooh ooh!! As I read the title and listen to the intro, I'm hoping they'd bring up sea squirts! I'm still in awe of how they're supposedly more closely related to us than a lancelet, implying that a free swimming chordate at some point found it more advantageous to stick its head into a surface transforming their adult stage into something that we may easily mistake for a sponge or sessile cnidarian

@Lexivor 18 дней назад

Barnacles found it advantageous to stick their heads to a surface as well. I wonder how many other times that's happened?

@beetbat5568 10 дней назад

Cool format! Neat to see other hosts/channels featured.

@humansampler8445 18 дней назад

I love a good crossover!!❤

@laserwizard2004 18 дней назад

Really love this episode format❤

@Walduhu 17 дней назад

10:16 That must definitely be the inspiration for Patrick Star :D Even the scientific name is similar.

@vertigofy6699 14 дней назад

I really love the new set. Sitting down presenting is a lot nicer actually!

@lynnbusch621 18 дней назад

Butt, no-body is arguing that these animals sacrificed too much to get a-head of the game!

@theDoodofLove 17 дней назад

Such a good vid!

@ktkrelaxedscience 15 дней назад

That premise! 🤣Well done! 👍

@angelindenile 14 дней назад

I loved the intro! Wonderful little skit :D

@scibear9944 18 дней назад

Point of order: The diagram dividing the scallop shell into "left" and "right halves is incorrect. Bivalves are organized such that each valve ("shell") is on either the right or left side of the animal, not the top and bottom as seems obvious from looking at how most of them orient themselves. Most of them are, in fact, lying on their sides😊

@turkoositerapsidi 13 дней назад

True. But brachiopods have that one tho. But they are something completely different.

@scibear9944 13 дней назад

@@turkoositerapsidi Yep. But they're such an obscure phylum I didn't think I'd need to mention them🤪

@turkoositerapsidi 12 дней назад

@@scibear9944 You didn't need, but I wanted to. 🙂

@js66613 11 дней назад

Multiarmed head for the win. xD Love the collab.

@MikeEngblom 13 дней назад

Love the new look and format

@grandgojira5485 День назад

The Ocean Sunfish took "laughing my butt off" way yoo seriously

@Draw1ng_Staars 17 дней назад

I’m geeking out at this cross over, I watch all of these channels religiously 😂

@fwosti3548 18 дней назад

very cute light humor in the beginning of the video :D

@davesatxify 17 дней назад

I love the way sci show presentation style has Evolved. :).

@HmmmmmLemmeThinkNo 17 дней назад

I saw this title and was like _please talk about the new starfish discoveries._ Happy to see that you did! :D

@Sprinklgrl 18 дней назад

So tardi grades found a genetic way to become chibi versions of themselves

@terragaze 18 дней назад

The plane of symmetry of the bivalve seems wrong at 1:54... Great video though!

@turkoositerapsidi 13 дней назад

Yeah

@archerelms 18 дней назад

This is fantastic

@melaniabladeofmiquella День назад

This is like an All Star science show!

@gwenpoole1071 18 дней назад

Avengers level crossover from all of my favorite channels. Genuinely made me smile. Thanks for this!

@mythplatypuspwned 18 дней назад

I just love how much genetic research has been done on species since I started watching documentaries on TV as a kid. There's so much new information that I keep finding out about every year now.

@feynthefallen 16 дней назад

Come to think of it, WHY is it that our sensory systems and our central processing facility are collocated? Sure, there are a whole lot of good evolutionary arguments like sensory organs requiring lots of nerves, short neural paths to the central brain and such, but there is a definite survival advantage to remote sensing facilities at the extremities and a well protected central brain in the body center. Just imagine a soldier being shot in the head, turning to his squad mates saying, "Sniper is on the left, behind the burned-out truck. Also, ouch, medic! Somebody else can stick their sensor pod out next, I've only three left as it is"

@denny8422 18 дней назад

nah y'all KNEW what y'all were doin' with the caption on the thumbnail LOLLL 😂

@kylekane5727 17 дней назад

Loved the video as always!! may I ask what is the first song that plays?

@MewtwoExMasterMusic 18 дней назад

I loved this episode

@TheMotlias 18 дней назад

Seeing Callie in the thumbnail, immediately watches video

@marilynlucero9363 18 дней назад

They just changed it, but I agree though, lol

@jeaniebird999 18 дней назад

@@marilynlucero9363 I am sofa king grateful for your comment; I thought I was losing my mind! I could have sworn I saw something different a moment ago! 😂

@qwertzuiop1230 18 дней назад

That’s a headless rhino Bro

@TheMotlias 18 дней назад

@@jeaniebird999 it's the RU-vid meta now, they will have 2 or 3 thumbnails and swap them out in the first hour to see what pulls the most engagement

@merteazy 18 дней назад

I thought we were calling someone a headless rhino. Was harsh bro haha

@ZeusTheIrritable 18 дней назад

This was a cool mashup of channels. Doing a show like this every few months would be a great way to cross promote.

@shiraga0516 18 дней назад

Echinoderms are all strange and interesting.

@Bakebami 3 дня назад

I really appreciate you making the point of that evolution is NOT a one way street of complexity where the more complex organisms are somehow the more "Superior" which is often how it is portrayed. Sure, humans are pretty complex creatures and that complexity is what has helped us survive and thrive, but that does not make us the supposed end-all-be-all of evolution. Evolution is about life finding ways to survive no matter the circumstance, and what works for some organisms might not work for others. A clam with a brainy head like ours would likely die off because its passive filter feeding wouldn't provide it with enough energy/nutrients to sustain a complex system like that, so it actively does better as a simpler organism. I've always been bothered by humans having this sort of superiority complex over other animals and I genuinely feel that hubris is what has lead us to neglecting and abusing so much of the natural world over history. Nature is worth admiration and respect regardless of the complexity of its organisms, and I think that teaching people about what evolution really means for life could help us all appreciate it a bit better!

@eggseventy4905 18 дней назад

an example of this type of body plan change i recently learned about is the subphylum Myxozoa! They're cnidarians that have opted into parasitism so strongly that theyre only a few cells large- some are even unicellular, and one species *doesnt even have any mitochondria.* As far as "animals evolving to lose things you'd think theyd like to keep, i think they deserve top billing for just deciding to leave this "being an animal" thing behind

@danvetor1365 4 дня назад

Reminds me of the Simpson's episode where the dog went through the malfunctioning time machine. One dog had two heads and one had two butts. Lisa , that one is yours!

@jamesleatherwood5125 18 дней назад

this is a cool collab of the major Complexly channels!

@carlosguimaraes624 18 дней назад

Awesome!

@mintagenart 11 дней назад

You know what they say: "Don't lose your head!... Unless it's evolutionarily advantageous of course."

@ginger-ale7818 12 дней назад

We need to do that genetic test on sea lillies (or whatever it is the few living crinoids are called). If their root and stalk are the trunk, which the starfish are thought to have lost when the groups split, it would explain where their bodies went!