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

Delayed plumage maturation in males is relatively common among North American passerines, but the Tree Swallow (Tachycineta bicolor) is one of few species in which 1-yr-old females have a distinct ...

The swallows have started to gather on Plum Island and they will reach their peak by mid-August. Along the Parker River Wildlife Refuge, they feed on the bayberry on the dune side of the road, and the ...

Female birds sing. That is one of the revelations of our 2020 study on one of the most abundant, widespread, well-studied bird species in the world: the barn swallow. Despite the well over 1,000 ...

Cliff swallows are said by ornithologists to show the highest degree of colonization of any of the 89 swallow species in the world. Colonies can number from 200 to more than 2,000 nests. They could be ...

The general trend in Marin bird migration is for most of winter’s abundant shorebirds and waterfowl to head north each spring, soon replaced by a variety of mostly insect-eating songbirds from Mexico ...

Female birds sing. That is one conclusion of our 2020 study on one of the most abundant, widespread, well-studied bird species in the world: the barn swallow. Despite the well over 1,000 scientific ...