so it is quite wrong to say, when a chick waves its wings in the nest "it's learning to fly". what the chick is doing is exercising its muscles. they develop the ability to fly "automatically" (assuming they are species that do fly). and if they are species which migrate, that behaviour is also inherited. many species migrate over great distances each year. other main features of their life may be inherited, though they can and do learn. birds have good memories which they use, for example, when they search for food.