#*evolution

[typhlonectes]

FUCKING CLADISTICS!!!

[mirthalia]

Aren't reptiles also really well known for their sense of smell?? I know we haven't studied reptiles as much as a lot of folks seem to think but snakes are frequently described as having detailed senses of smell (and the eyes of several species block out ultraviolet light as well).

Anyway here's that video:

How The Nocturnal Bottleneck and Nipples Make Us Human

Almost every post here considers what humans do have, really. It’s a little tiring; realistically every world has its harsh environments and vicious species and a sophont to match. We probably wouldn’t be unique for our adaptability or our persistence or even adrenaline

But our evolution is fucked up as hell, to put it lightly.

Mammals went through what’s been dubbed the nocturnal bottleneck essentially since the start of the mesozoic right up until the Cretaceous ended the archosaur’s exclusive hold over the daylight. We lost a lot of things from every mammal spending most of its time in either a cramped, suffocating burrow or scrounging around in the faint hours of nighttime. Our blood cells lost their nuclei to hold more oxygen while we spent time deep underground, we lost protections against ultraviolet rays in our skin and eyes, we can’t even repair our own DNA using the light of the sun. Most aliens probably wouldn’t have such traits unless their evolution followed a very similar path to ours. They’d be able to see ultraviolet and wouldn’t have to worry about sunburn and all the wonderful privileges essentially all fish, birds, amphibians, and reptiles enjoy as we speak. 

There’s also what we gained from spending so much time in the dark.

Brown fat is only found in mammals, it’s a special type of fat which bear cells with several oil droplets and are utterly jammed with mitochondria. This lets it make heat, a lot of it, fast. We don’t even need to shiver to induce this heat generation from brown adipose tissue - factor in our downright hyperactive mitochondria, and we can warm up quickly. Sure, it doesn’t have too much use in adult humans, but it keeps our infants warm and still provides a little boost the whole run we have in this universe.

Unless aliens also went through a time where their small ancestors had to face cold nights, they’d have to produce heat the old fashioned way when chilled. Aliens might have to shiver the whole time they’re in a cold room while the human watches in confusion, quite literally unshaken, and wonders if the room is a lot colder than the thermostat set to 60 says. The aliens stare at their companion in confusion, it’s just a normal temperature to shiver at after all, how is the human sitting so still?

Our small ancestors spending all their time out foraging at night is also why we have such a good sense of touch, smell, and hearing. They were more important senses than vision (we’re lucky to have even redeveloped basic color vision, frankly) at the time and place and simply ended up continuing to serve us well. Birds and reptiles rarely have acute senses of smell and the latter especially are lucky to have acute hearing, and birds rarely have impeccable hearing themselves either. Our skin is free of scales and honed to sensitivity, and our external ears and complicated ear bones provide an immense range of hearing (from 20 all the way to 17,000 hertz!).

Aliens might not be able to pin down the chirp of a cricket or the light click of a lock being picked. The human might be the only one on board a ship that can pick out the finer sounds of the engine’s constant thrum and know the critical difference between when everything is fine and when something is wrong. The human could probably pick out the sounds of an approaching enemy’s careless footsteps - they’re only as light enough for *them* to stop hearing them, after all - and be the one to see the horrified expression (well, more on that later) on their face when we get the drop on them in spite of their perceived stealth. 

But perhaps the most versatile, convoluted, amazing, and utterly unique trait we have is right on your face this instant. Lips.

Lips in most animals are a simple seal to hold in the mouth’s moisture and protect the teeth, even if they’re supple they’re NEVER muscular except in mammals, and we have only one thing to thank for it; milk and nipples. Lips evolved exclusively to allow babies to suckle, it required a vacuum to be created in the mouth, and with no other animal having anything like a nipple it never happened in other animals. Many animals make milk, to be frank, but no other animal has nipples.

Your cheeks and lips are a marvel among tetrapods, no other animal can suck like mammals can. Aliens wouldn’t have straws or even be able to sip from the edge of a glass, they’d have to have a proboscis or simply tilt the whole thing back. Aliens likely won’t have woodwind instruments or balloons you can blow into. We take so much about our lips for granted. Hell, our muscular faces are vital for expressions, we’re probably absolute facial contortionists among a cast of creatures with mandibles and beaks and expressionless scaly maws. Aliens might find us ridiculously easy to read, if anything, compared to their own kind (all the better to deceive them) - or perhaps they’d find us hard to decipher anyways, with our lack of color-changing skin or erectable crests of bright feathers. Baring teeth might not be seen as a sign of aggression in most of the universe, smiling would be all too distinctly human. 

Perhaps with how infectious we are sometimes, that’s what we’d contribute to the universe; others might have to make do with opening their mouths just enough to show their teeth or splaying their innumerable mouthparts with just the right curve, but perhaps we’d teach the galaxy to smile, one ally at a time. 

Wouldn’t that be amazing?

[katborg82]

Dinovember day 21!! @1dinodaily A pair of mischievous Afrotapejara test the patience of a sleepy giant.

[elenath9]

The classic hurt Daniel face

Stargate SG-1: Evolution, Part 1

[olive-ridley]

All roads lead to Rome, all lineages evolve to CRAB 🦀🦀

[druid-for-hire]

[image id: a four-page comic. it is titled "immortality” after the poem by clare harner (more popularly known as “do not stand at my grave and weep”). the first page shows paleontologists digging up fossils at a dig. it reads, “do not stand at my grave and weep. i am not there. i do not sleep.” page two features several prehistoric creatures living in the wild. not featured but notable, each have modern descendants: horses, cetaceans, horsetail plants, and crocodilians. it reads, “i am a thousand winds that blow. i am the diamond glints on snow. i am the sunlight on ripened grain. i am the gentle autumn rain.” the third page shows archaeopteryx in the treetops and the skies, then a modern museum-goer reading the placard on a fossil display. it reads, “when you awaken in the morning’s hush, i am the swift uplifting rush, of quiet birds in circled flight. i am the soft stars that shine at night. do not stand at my grave and cry.” the fourth page shows a chicken in a field. it reads, “i am not there. i did not die” / end id]

a comic i made in about 15 hours for my school’s comic anthology. the theme was “evolution”

[typhlonectes]

What Happened to the Other Mesozoic Mammals?

In 2003, a fossil belonging to a mammaliaform was discovered in an ancient lakebed in what's now China. It was an almost complete skeleton the size of a platypus, a find that complicated the history of mammaliaforms. It painted a picture of their explosive diversification, their mysterious disappearance, and how our own ancestors might have survived thanks to a leg up from some leafy allies. *They weren't /exactly/ mammals...

via: PBS Eons

[theartofmadeline]

i promise i wouldn't blame you

[samimarkart]

Grounded Flight

2024, decolorant screenprint on quilted cotton

[casualcarpetshark]

BOW DOWN TO THE ANCIENT ONE

[katborg82]

Dinovember day 20!! @1dinodaily Yi qi takes flight!

[prokopetz]

If you've seen trivia posts going around, may have seen ones about the baculum, a bone in the penis whose purpose is to help support erections which is present in most placental mammals, including non-human apes, but which is conspicuously absent in humans.

Those posts typically don't go into why this is the case, which is fair enough, since the question is far from settled. However, there are a lot of hypotheses about it, and some of them are pretty fucking wild.

I think my personal favourite is the recently proposed idea that, since soft tissue injuries tend to heal more rapidly and completely than broken bones, a flexible and resilient boneless penis constitutes a reproductive advantage in situations where genital trauma is common, possibly as a result of the development of upright posture rendering the penis more prone to blunt encounters.

Like, imagine humanity's proto-hominid ancestors going "actually, bipedalism is great" and promptly getting whacked in the ding so much that it exerted evolutionary pressure on the morphology of the penis.

[scentedwonderlandpoetry]

Further new discoveries have been made on my theory.

[todaysbird]

Thank you Grandpa Iridescence…

[console-pokeballs-rupees]

fantasizing about evolution by フキダシコットン on X