Birds live in nests which are either located on the ground or in bushes or trees. Some bird species build nests within holes that they burrow in the sides of trees while other birds favor making nests in the tree tops.
Different bird species favor different habitats for building nests, such as forest clearings with a single tree, wooded areas or even swamps. Bald eagles build nests high up in trees and use mostly twigs and branches while robins will construct nests out of mud, grass and twigs in trees or bushes. Barn swallows build small nests out of grass and mud and prefer man made structures like barns or houses for nest locations.