Learn how to identify a male and female tree swallow. Find out about their nests, song, range map and what tree swallows eat.

The violet-green swallow is a shiny green flier that swoops and soars in the West. Discover where to find them, what they eat ...

A new paper in Environmental Toxicology and Chemistry, published by Oxford University Press, indicates high levels of exposure to “forever” chemicals in the environments of many tree swallow bird ...