Tree Swallows.  This is what I have in my blue bird house instead of blue birds. Cute little birds.

Tree Swallows. This is what I have in my blue bird house instead of blue birds. Cute little birds.

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 Swallow -  breeds in North America & winters in Mexico, Central America & Caribbean

Tree Swallow - breeds in North America & winters in Mexico, Central America & Caribbean

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.

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.

Tree Swallow in Flight (Tree Swallow - Tachycineta bicolor) - photo by Tin Man Lee

Tree Swallow in Flight (Tree Swallow - Tachycineta bicolor) - photo by Tin Man Lee

Tree swallows perch on a branch during a spring snowstorm in the US town of Pembroke, New York state.

The week in wildlife – in pictures

Tree swallows perch on a branch during a spring snowstorm in the US town of Pembroke, New York state.

Tree Swallow babies, Ridgefield National Wildlife Refuge, Washington, obviously yelling, "MOMMY! MOMMY!"

Tree Swallow babies, Ridgefield National Wildlife Refuge, Washington, obviously yelling, "MOMMY! MOMMY!"

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