Tree swallows have a more varied diet ... These birds are commonly seen swooping low over fields or water, eating their food on the go. But they’re also known to look for prey up to 100 feet ...

Nest boxes help many species of birds, including eastern bluebirds, tree swallows and wood ducks, by providing protection ...

The western counterpart of the tree swallow, the violet-green swallow has narrower wings and a shorter tail. This species frequently uses nest boxes. Polytypic (3 ssp., none separable in the field ...