Two parrots egged each other and dance together. Many owners of birds interested in the question as to why a parrot dancing, likes to listen to music, reacting to certain songs. Involuntarily the question arises, what sounds prefer these Pets and why.
Oka is unknown, how is it that some birds make sounds, move rhythmically, and others. But it was possible to notice that the birds who lived with people for a very long time, often prone to dancing.
There is even a version that rhythmic oscillations animals have adapted, looking at people and getting them enthusiastic emotion. However, the social factor cannot be considered fundamental.