Meet Snowball, a sulphur-crested cockatoo whose viral fame skyrocketed when he danced along to the Backstreet Boys.  Not just a one-beat bobber, scientists found he uses at least 14 distinct dance moves, responding to rhythm with surprising variety and seeming spontaneity.  His talent suggests that, unlike most animals, some birds may truly “feel the beat,” and dance isn’t just mimicry but an expression of cognitive and musical processing.