Chimpanzees and bonobos are amazingly similar ... Bonobos are about the same size as chimps but are more slender and lithe, with longer legs and smaller, rounder heads. Chimps have a heavier ...

Humans have a distinct size advantage. A chimp uses all of its limbs to run, moving at 25mph, while humans can only sprint on two legs with an average speed of 18mph. Chimps are faster than men ...