A common sight these days is a bird carrying usually some sort of bug in its bill, headed for a nest of baby birds squawking, with bills wide open to receive it.

Nests can be found in potted plants, on branches, piles of twigs and leaves, in holes, attached to buildings, and in tunnels; some as big and heavy as a car — such as those of eagles — and some, for hummingbirds, small as thimbles.