Crows are the smartest birds in the animal kingdom who give zero ducks. Want proof? Just take a look at any of the funny photos below. Crows (and corvids, the family that includes crows, ravens, rooks, and magpies), like to pull the tails of birds and animals who are twice as big as them because they are not afraid. Some argue that this unusual bird behavior was developed to snatch food away - but the other theory is that these cool birds simply like to behave like major assholes.