Bioko-chimps may have slept in seaweed nests floating on the water


Chimpanzees won't sleep on the ground, where there are snakes and predators. A mother will build a new nest in a tree each day, to sleep with her baby above the ground. Even a newborn baby is strong enough to cling to branches and the mother's fur for security. 


On volcanic proto-Bioko, without trees, mothers might have chosen to sleep in a nest of floating seaweed, rather than on the hard rocky ground. Some seaweed has buoyant air pockets that make it float. 


As Bioko-chimps were evolving into humans, they could still sleep in nests on the water. Even a newborn human baby is buoyant enough and strong enough to hold on to floating seaweed for security. A mother with long oily head hair, like a human, would have babies with increased chances of survival. 


A Bioko-chimp in a wet floating nest would sleep on its back. If the baby were born with a slightly more protruding nose, it would function like a snorkel and give the baby increased chances of survival. The aquaboreal proboscis monkey has a human-like nose, whereas the chimpanzee, gorilla, and orangutan do not. Their ancestors were probably not aquaboreal.

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