Before I get into it, just know the pictures just serve as visual representations, not actual pictures
Okay so anyway, evidence for this theory is the following:
THE FACT THAT HUMANS ARE SO HAIRLESS:
Only two kind of habitats give rise to hairless animals, an aquatic one and a one below the ground (a naked mole rat for example)
.The suggestion that humans have become hairless to prevent overheating has been rendered false because hair can act like a defense against the sun.
This is why camels retain their fur even in the hot dessert environment.
OUR FAT CELLS
We have ten times the number of fat cells as expected in an animal our size. Only two types of animals have large fat cells: hibernating and aquatic ones.
In hibernating it’s seasonal fat, but in aquatic it’s all year round. It’s unreasonable to think that we evolved this feature in land because large fat pockets would have just slowed us down.
Primate babies are always born slender, but human babies start to develop fat even before birth.
WALKING ON TWO LEGS
So we’re the only mammals that have developed bipedalism. This is a surprise, because walking on 2 legs vs. walking on 4 legs is very disadvantageous. It’s slower, unstable, our organs are vulnerable to damage.
One theory is that if our habitat was flooded, we’d have to walk on two legs to keep our heads above the water.
The only animal who has ever evolved a pelvis like ours, the swamp ape, used this method.
We have conscious control over our breathing. Ever other land animal doesn’t. Mammals like dolphins and seals also conscious control because it tells them how deep they are going to dive and they can estimate how much air they need to inhale.
Our body is so wasteful of salt and water. Think of tears and our way of sweating. Other land mammals don’t have this. Water mammals do however.
Okay anyway I hope you learned something.
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So. Basically. We were FUCKING MERMAIDS. Damn.
I mainly want to believe this is correct so I can be descended from mermaids
Also! we’re pruny. we have a better grip on submerged objects when our fingertips are pruny. ah wow theories,
Uhhhhhhhh there’s a reason the vast majority of anthropologists and paleobiologists reject this hypothesis. I’ll admit, I was also drawn in when I first heard about the idea. I’ve looked into it further, and it’s tempting to believe, considering that it seems to answer all the mysteries. To the debunkatory!
First off, some people are pretty fuckin’ hairy. Not usually to the extent of other animals, but I’ve seen a few who wear a permanent sweater. Beyond that, the hypothesis claims that early hominids spent time in a semiaquatic environment. The vast majority of semiaquatic mammals have a thick coat of fur: otters, beavers, and capybaras, to name a few. And yes, fur helps cool inactive animals, but creatures engaged in vigorous physical activity cool more efficiently from sweating. It’s why my dogs suffer a lot more than I do in summer, particularly after we’ve been running around. Also, pigs, rhinos and aardvarks. All relatively hairless.
Ten times that expected for a mouse, maybe. Human fat cells, along with those of other primates, are smaller than the fat cells of other mammals like rats and mice. Rats and mice have adipocytes that expand and contract as the creature gains and loses total fat content. Since ours are smaller, we need to increase the number itself when we need more fat, making them harder to lose once gained. Additionally, the fat that we amass, subcutaneous fat, is functionally very different from the insulating fat of aquatic mammals. In fact, subcutaneous fat is the first to be lost in cold surroundings, and is more likely a method of storing food energy. The very expert quoted to provide support for this aspect has herself rejected the idea.
Only ones? Kanga-fucking-roos.
That having been said, the fossil record shows strong evidence that our early ancestors were experimenting with terrestrial locomotion, dividing their time between the trees and the ground. AAH suggests that longer legs of bipeds would aid in swimming, but longer legs appeared quite late in the fossil record. Biomechanical analysis has shown that our evolutionary ancestors were poor swimmers compared to other animals, as are we. And bipedalism isn’t entirely deleterious on land. A greater appearance, in our case, height, deters predators. Our legs are actually stable and efficient; we can move at a walking pace expending very little energy, with our legs acting like pendulums, transferring our momentum into each subsequent step. Furthermore, the most recent evidence and work on the Oreopithecus, which I took to be the “swamp ape” mentioned above, moved generally by suspensory locomotion through an arboreal swamp environment, relying on quadrupedalism on the ground—just as our ancestors did.
This is actually believed to be an effect of bipedalism rather than a naturally selected trait. In an upright posture, breathing is not tied to the muscles required for locomotion. Increased breath control is believed to be an extension of our developed ability to communicate verbally. Our larynx is also different from those of aquatic mammals, making us more likely to choke.
Check out these links, tumblweeds:
Blog Post of a Professor of Anthropology
I hope you learned something today.
Be critical, not gullible.