Convergent evolution thread? Convergent evolution thread.
Staring with sort of a stretch
it's pretty crazy to see animals with completely different ancestries and DNA end up so similar.
Marsupials and Placental mammals split over 150 million years ago, but look at this shit.
explain this shit
nearly identical organs, evolved from totally different structures (vertebrates being outgrowths from the brain while the octopus evolved from its skin) in very different animals, cephalopods having evolved before fucking trees existed.
shit like this is why I don't think the concept of humanoid aliens is as outlandish as some people think.
All flying creatures started out as gliders. Although I suppose flying fish should more easily be compared to flying squirrels and those snakes that jump from treetops and glide through the air.
Quick tip: If you ever find one of these guys in your house, give them water and feed them rodent lab blocks before letting them outside. Unless it's injured in some way, in which case you should take it to a wildlife rehabber if possible.
They rarely come into houses unless they're VERY hungry. Flying squirrels have extremely high nutrient requirements and easily die of metabolic bone disease (which happens due to insufficient calcium and vitamin D).
Lab blocks have a lot of nutrients that the squirrel can use to regain its strength and heal from early stage MBD before its too late.
After feeding and watering the squirrel it would be good to leave some lab blocks in a clean, dry place nearby so the squirrel can eat again. I believe they can also eat button mushrooms, especially the kind that have vitamin D.
But, just to be clear--mushrooms aren't anywhere near as nutritious as lab blocks. I think they can be given as a treat or for a little help, but they won't fix MBD or any serious nutritional deficiencies.
Lab blocks are the gold standard for feeding pretty much any kind of common omnivorous rodent in need.
>tfw blind spot
if anyone can explain pic related without googling then you are my soul mate
Obviously not. This is the fate of all /an/ threads.
This or bugguy.
Completely related anon, in a few cases, completely unrelated fish developed extremely similar antifreeze proteins to the point that they have the same threshold for the coldest temps they can withstand. Along with extremely analogous protein structures. I wish I could source but it's been a while since I've studied af proteins.
impossible to say since the margin for error on our dating methods is a few million years.
also rocks that record the few million years just before and after the boundary are pretty fucking rare and the bones of reptiles are large enough that the bottom can rest on one layer and the top can be in another layer that's ten million years newer.
I always thought the Dimetrodon/Spinosaurus/Crocodile jaw notch thing was weird.
It kinda boggles my mind that marine reptiles developed a reversed heterocercal fin instead of a normal heterocercal. What advantages did it had?
Assuming it isn't just a product of other things like fabricational factors and stuff...
>Sharks use their asymmetric tail fin to compensate for the fact that they are negatively buoyant, heavier than water, by making the downward pressure exerted by the tail force the body as a whole in an ascending angle. This way, swimming forwards will generate enough lift to equal the sinking force caused by their weight. In 1973, McGowan concluded that, because ichthyosaurs have a reversed tail fin asymmetry compared to sharks, they were apparently positively buoyant, lighter than water, which would be confirmed by their lack of gastroliths and of pachyostosis or dense bone. The tail would have served to keep the body in a descending angle. The front flippers would be used to push the front of the body further downwards and control pitch.
How about the highly complex brains that both hominids and corvids developed.
It's amazing how we actually have dinosaurs which developed essentially ape-like cognition and behaviour.
Yes the left one is Chioglossa, the right one is Plethodon. That works too I guess but wasn't the original reason.
Different genus in different families that are lungless with long tails in order to have a larger respiratory surface, the skin (given that Plethodontidae are all lungless; Chioglossa being a Salamandrid)
Another example of the same convergence is the genus Onychodactylus in the Hynobiidae family.
Pic is another neat convergence in a Plethodontid and the olm (Proteidae).
Maybe you'll find something here, I don't have time to look that into it right now.
I'll look into it man, don't bother too much. I was intrigued because I've never read anything about it (not that I read that much anyway).
Here's an opacum for your trouble.
They're both xenarthrans but not necessarily close. Elephants and hyraxes are closer to each other than to monkeys by virtue of being afrotherians, but are still far apart from each other.
Being in the same order means the similar body shape, limbs and diet are not convergent evolution but evolution not divergent enough.
>Elephants and hyraxes are closer to each other than to monkeys
No shit, they are also closer to manatees than fucking squirrels, how is that in any way surprising if you know about taxonomy?
It's not really complex. Light sensible cells for simply for day circle detection > skins folds around them forming a camera obscura for light direction > filled with liquid for protection against dust. Lens-bearing eyes have evolved seven times independently, compared to just flying evolving just 4.