Before 8 am in Vail, CO, 140 birds had already left their nests; you know the saying: the early bird gets the worm. Over the next 2 hours (8-10 a.m.), 140 more birds leave their nests slow steady pace, making a total of 280 birds out of their nests. The birds currently out are looking for food and stay out for 3 hours (10 a.m. -1 p.m.), getting enough food for their babies and wives at home. Then the birds come back at a fast, constant rate, for 3 hours (1-4 p.m.), including those who left early. There are only about 35 birds still out. This overall process takes 8 hours.