[martianagent]

...The lack of body hair provided an interesting advantage....

The lack of a fur coat is a disadvantage for any sort of life on land, as is the subcutaneous fat which humans have; they are adaptations for life in water. Get a copy of one of Elaine Morgan's books and read the real version.

[null and void]

Even a water ape needs to get out of the water (and warm up) once in a while...