The Ulas mother and father had a staggering 18 children, however, of these, only six were born with quadrupedalism (walking on all fours), which has never been seen before in modern adult humans.

Since its discovery, some have tried to interpret this quadrupedalism from an evolutionary perspective, suggesting that it’s an expression of our primate ancestry -- an instance of evolutionary ...

The athletic and dangerous art of parkour involves running, jumping, climbing and quadrupedalism (using all four limbs) while moving through various terrain. Scroll down for video Parkour ...