For those who like some random science facts, Jellyfish and their relatives (Hydra, Portuguese Man-of-War, Sea Anemones) don't have a brain and a true nervous system but rather a "Nerve Net." Animals with these don't "think," like in the sense as vertebrates (reptiles, birds, mammals, and so on) do but rather just react to their environment. It's much more simple but they can feel pain, feel changes in pressure and temp., tell the difference between food and well not food, etc... But it's interesting since this is like one of the earliest forms of an actual nervous system which gave rise to more complex ones that many animals like us have today. It also hints at just how old these animal species are to have such a basic nervous system as well!
So they are sentient? In that case, It's interesting how wide the spectrum of sentience is. That makes me think, are plants sentient? Like the jellyfish they dont have brains. And i would assume they kind of react to the enviroment in the same way. The venus flytrap attracts and devours insects for instance.
@@Exype Good point. I'd personally argue** (since I don't have an actual professional backing in this area I won't claim to be an "expert" just college experience if anything) they are not sentient. These animals, like I pointed out, just aren't capable of thought at all let alone any sort of "self awareness," as far as I know. It's subjective on what one means by "sentient," I'll acknowledge that but in the case for these two traits then these animals are a far cry from sentience. And plants are interesting too. I didn't explicitly state this before but plants, as in the whole kingdom of plants, don't have neurons (the main cells for a nervous system) and anything like a nervous system that animals from the animal kingdom can have. Plants are reactionary but through other means where for example the cells responsible for photosynthesis ( in a tree let's say) will signal with chemicals to other cells (that focus on growth) to grow over there where I can get a lot more light. And the tree will extend a branch, lean over a bit, etc.... across a very long period of time. In contrast if animals want to move from place to place, it can take anywhere from seconds, minutes, but not years to get there. And as for very rapid moving plants like the Venus Flytrap, it's very similar. These plants still don't have a nervous system but cells responsible for checking out their prey in the "mouth-leaves," of the plant to detect whether I can eat this or not. These cells then release signals giving the A-okay for the "trigger"-cells that then close the mouth and release chemicals (enzymes I think) to digest the prey. But these plants don't have nerves, tendons, muscles or any specialized cells for actual movement. That too is really interesting and another cool area to look into. Sorry for the long comment but I hope it's helpful :)
oh i see....you're a evolutionist who thinks this is how we all started.... and so what.....now we're all a bunch of half educated monkeys with clothes???????
I'll bet filming amongst all of those jellies was somewhat claustrophobia inducing. These camerafolk are outstanding. Then with Sir David narrating your work, you know you've made it to the top of your profession.
The the big swarm species in this video is completely harmless though... I always played with them on the beach (in the water) and they often came in huge swarms like this one. Only when the colorful jellyfish came I got the fuck out of the water 😅
@@i.i.iiii.i.i Meanwhile about a year ago when I was at the beach is Croatia, I had seen a (probably dead) moon jellyfish. I instantly rushed out of the water and went catching crabs. Not sure if i'm lucky to live far from oceans to not encounter jellyfish normally. Oh wait where I live we have freshwater jellies yay
Some are completely harmless to humans, there’s even a lake full of jellies and you can swim with the, granted you know how to flat since the lake is pretty deep.
@@tatianaG is that like the teeny tiny one that slips through jellyfish net guards and are even deadlier than box jellies? I think I remember clips of scientists catching them in Australia???? And they're like, "okay we gotta catch these smol guys but plot twist we can barely see them and they deadly af, good luck:D"
To this day, I can still randomly say the quote “Jellyfish have no brain and no blood. But they *_do_* have eyespots that enable them to tell the difference between light and dark”
BBC: "They Look Like Haunted Marshmallows" Also BCC: here's A Bunch Of 45 Documentaries on wildlife inhabiting coastal islands. Me: hhndbhnnnnnnnnnnnnnddndkkj coconut crab.
You’re gonna get mind blown when you realize box jellyfish actively hunt for their prey, probably one of the smartest jellyfish, and they have eyes too.
