The Tree Swallow (Tachycineta bicolor)   is a migratory passerine bird that breeds in North America and winters in Mexico, Central America and the Caribbean.

The Tree Swallow (Tachycineta bicolor) is a migratory passerine bird that breeds in North America and winters in Mexico, Central America and the Caribbean.

Tree Swallow. Handsome aerialists with deep-blue iridescent backs and clean white fronts, Tree Swallows are a familiar sight in summer fields and wetlands across northern North America. They chase after flying insects with acrobatic twists and turns, their steely blue-green feathers flashing in the sunlight.

Tree Swallow. Handsome aerialists with deep-blue iridescent backs and clean white fronts, Tree Swallows are a familiar sight in summer fields and wetlands across northern North America. They chase after flying insects with acrobatic twists and turns, their steely blue-green feathers flashing in the sunlight.

Tree Swallows. Photo: Jerry Amende/Audubon Photography Awards Most kinds of birds defend territories during the breeding season, driving away other birds of their own kind. Tree Swallows don’t defend large feeding territories, since they range widely in pursuit of flying insects, but they can be very aggressive in defense of their nest site. Early in the season, when the swallows are choosing nest cavities, they often engage in spectacular aerial skirmishes over choice sites.

Tree Swallows. Photo: Jerry Amende/Audubon Photography Awards Most kinds of birds defend territories during the breeding season, driving away other birds of their own kind. Tree Swallows don’t defend large feeding territories, since they range widely in pursuit of flying insects, but they can be very aggressive in defense of their nest site. Early in the season, when the swallows are choosing nest cavities, they often engage in spectacular aerial skirmishes over choice sites.

Tree Swallow in Nis-qually WL Refuge, WA State. 'King of Iridescent Blue' photo by Janet Rider on 500px // 500px

Tree Swallow in Nis-qually WL Refuge, WA State. 'King of Iridescent Blue' photo by Janet Rider on 500px // 500px

Swallows. The return of the swallows is something I look for each year. They tell me summer has arrived.

Swallows. The return of the swallows is something I look for each year. They tell me summer has arrived.

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