Tree swallow

Description

This swallow averages 13.5 cm (5.3 in) long and weighs about 20 g (0.71 oz).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 grey breast band.