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This swallow averages 5 inches long and weighs about 20 g. The bill is tiny. The adult Tree Swallow has iridescent blue-green upperparts, white underparts, and a very slightly forked tail. The female usually has duller colours than the male, often more greenish than the more bluish male. The juvenile plumage is dull grey-brown above and may have hint of a gray breast band. Being highly social outside of the breeding season, tree swallows may form flocks of several thousand birds near roost sites.
This guy spent about ten minutes checking out one of our as yet unoccupied bluebird boxes & seemed to be calling for his mate. Hopefully we will have some new tenants soon!