‘all the dead birds had become intoxicated on fermented berries, and that some of the injuries they had sustained were the result of mid-air collisions’. Drunken Birds. (read more)
playfulness may serve an evolutionary role in human mating preferences by signaling positive qualities to potential long-term mates.
Just as birds display bright plumage or coloration, men may attract women by showing off expensive cars or clothing. (read more)