All birds lay eggs, none give birth to live young.
Birds must prepare a place to lay their eggs and must care for them during incubation and while the young are dependent after hatching. By exploring nesting behaviors much can be learned of how birds have adapted to meet the various challenges of reproduction. Nests, the eggs or young in them, and attending parents tempts a variety of predators. The nest structure and location, as well as adult behavior while on the nest determine how much risk is involved. Site Selection Nesting sites may be made by either members of a pair of birds, or constructed jointly.