Hummingbirds dive to sing with their tails

Many birds sing to woo females, but some hummingbirds go to great lengths to do so. They climb to between 5 and 40 metres before plummeting past perched females in death-defying dives. They pull up at the last minute, spread their tail feathers and produce a loud chirpy song. The song comes not from the birds' mouths,… » 9/11/11 2:30pm 9/11/11 2:30pm