(CNN) — A head-banging parrot who became a YouTube sensation has demonstrated that an ability to appreciate music and keep a rhythm is not unique to humans, scientists say. Snowball the cockatoo, who appears to bop his head, tap his claws and squawk enthusiastically to the Back Street Boys’ “Everybody” is one of several birds apparently capable of dancing to a beat, according to two studies published in the latest edition of the journal Current Biology.
