Animal Dancing

This article is fascinating. Money quote:

We took the Backstreet Boys song, sped it up and slowed it down at 11 different tempos, then videoed what Snowball [a Sulfur-Crested Cockatoo]did to each. For 9 out of the 11 variations, the bird moved to the beat, which meant that he’d processed the music in his brain and his muscles had responded. So now we had the first documented case of a nonhuman animal who, without training, could sense a beat out of music and move to it.