How zebra finches learn to sing
(PHYSorg.com Biology)

Complex learning processes like speaking or singing follow similar patterns. Using the example of zebra finches, researchers at UZH and ETH Zurich have investigated how young birds imitate the courtship songs of their fathers and practice them thousands of times. The study has revealed what aspects of the song are remembered overnight, and that sleep allows the bird to optimally build upon the progress made on the previous day.