Anthropology --Predators, Locomotion, Credulity

We are predators, it's not our fault. Everything about us is predatory. The very fact that we move about on two feet is predatory. As hunters we need far sight.

We do, or did have at least two or three serious predators of our own to contend with --one is the tiger. It's said that we inherited our extreme gullibility because of our predators. 

When someone yelled, "Run! There's a tiger behind that rock!", no-one stopped to demand proof with triple-blind experiments, they RAN.