Crocodile Thumb Defense
If you're ever attacked by a crocodile, stick your thumb in its eye. Easier said than done, of course, but wildlife experts agree that this is the best way to save yourself in the event of a crocodile attack. The eyes are the most sensitive part of its body, and jabbing at them should, ideally, cause them to loosen their jaws.
Only Humans Blush
We are believed to be the only animal that feels embarrassment. Charles Darwin called blushing "the most peculiar and most human of all expressions," while Mark Twain said, "Man is the only animal that blushes. Or needs to."