Vampire bats know the true meaning of friendship—sharing slurps of blood
Who wouldn't want to be pals with this cutie? (Daniel Streicker//)Would you let a stranger borrow your car or your favorite pair of shoes? Probably not. What about your best friend?You’re arguably more likely to hand over your keys or your ritziest kicks to your BFF, of course. But once upon a time, the person that you adore most was also a stranger—and the road from random acquaintance to closest pal can be a long journey. Friendships always take time, as each of you slowly builds trust for one another. After all, you don’t want to lend someone your ride who wouldn’t do the same for you.“If the other person doesn’t cooperate with you, you’re even worse off for trying to start that relationship,” says Gerald Carter, a professor of behavioral ecology at Ohio State.This idea of slowly investing your time, energy, and supplies into a trusting friendship isn’t new....