we talked about the great apes in my anthropology class, which was also the worst class ive taken in my life. a gorillas limb bones are thicker than baseball bats, and their centers of gravity are much farther back than a humans. that way, they could punch a hole clean through your chest if one were so inclined. bottom line, i wouldnt want to fuck with a gorilla...or a lemur either...they throw their shit at you.