The Tree swallow is a slender bird that is typically between five and six inches in length. They can be identified by a white underside and a shiny, dark blue-green backside. This swallow is indigenous to the northern United States and Canada. During winter months, it lives along the southeastern coast. Tree swallows often build their nests in bird houses.
Swallows are beneficial birds that consume large quantities of insects.
It says the swallow is mainly an insect-eating bird. Different species of swallows prefer different types of insects. For example, the Purple martin typically eats dragonflies, moths, and butterflies. Barn swallows consume large flies, and when the weather is bad they eat other insects off the ground. Besides insects, the Tree swallow eats a variety of seeds and berries.