We have 10 times as many fat cells in our body as any other animal of similar size. Unlike other primates, our children are born fat with a large proportion of white fat which is good for insulation and buoyancy but not for energy. Morgan thinks it is an adaptation that protected babies that had fallen out of trees. As with most aquatic animals, but unlike other primates, our fat is present all year and is stored, not deep within the body, but under the skin where it serves as an insulative layer. The only other mammals that store fat in this way are aquatic, like dolphins, seals and hippos.
Humans are the only primates which have the ability to hold their breath voluntarily.
The only other mammals that are able to do this are aquatic diving animals like seals and dolphins. The descent of the larynx that occurs in the human infant at about three months is an adaptation that allows air to be gulped in large quantities through the mouth. The only other mammals that have a descended larynx are the sealion and the dugong. We have larger brains than any other ape. The mammal with the largest proportionate brain size after humans is, of course, the dolphin - a terrestrial animal that returned to the sea.