By the time young songbirds are ready to fledge, they are their full adult size. Many young songbirds of both sexes resemble the female of their species. Only when they are old enough to mate does the coloration difference in some species begin to appear. For these species, just remember , the rule of thumb is two weeks to incubate and two weeks until fledging. It is assumed that the reason for this is that these young must be taught to hunt, not just scavenge for food.
Birds of prey are pure carnivores.
Meat, in some form, is their sole diet. Nest building for these birds generally begins in late winter and early spring. Some species will be spotted carrying twigs and branches for several weeks during this time. Some, such as the barn owl, often use barn lofts, haystacks or any other high, flat man-made structures as their nests. Birds of prey nest sites are varied and cannot be pigeon-holed into a specific category.