The document describes the nesting behaviors of several bird species. Pigeons build flimsy nests of straw and sticks on ledges, often of buildings. Eagles build large nests called eyries in tall trees or cliffs and often the older chick will kill the younger. Parrots nest in tree hollows and lay white eggs. Ducks nest on the ground near wetlands using dried grass and feathers. Sparrows make coarse nests often next to each other and sometimes sharing walls. Hummingbirds weave compact nests out of twigs, fibers and leaves anchored with spider silk and lay eggs the size of navy beans.