The attractive Tree Swallow breeds over most of North America, and winters in the extreme southern US and Central America as far south as Honduras. They spend their days coursing over meadows, ponds, rivers, and lawns at about 19 to 25 mph snatching up flies, ants, beetles, bees, wasps, grasshoppers and other insects. They also eat weed seeds and bayberries. It is one of the most aggressive of the swallows, and the male will defend a relatively large territory around the nest site.
The adult male is metallic blue with a greenish sheen on the upper side. Under parts are pure white.