Tree Swallow In Fly, They Are Common And Widespread Throughout Most Of North America, Breeding As Far North As Alaska And Wintering To Panama. A Medium-Sized Swallow, With Gleaming White Underparts. Adult Males Are Bright Iridescent Blue-Green Above; Females And Immatures Are Duller Brownish With Limited Or No Iridescence. Always Note Compact Shape, Fairly Broad Wings, And Slightly Notched Tail. Occurs In A Variety Of Open Habitats Including Grassy Fields, Lakes, And Marshes. Often In Flocks, Sometimes Mixed With Other Species Of Swallows.

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adult alaska always america audio bluegreen breeding bright broad brownish compact duller fairly far females fields flocks gleaming grassy habitats immatures iridescence iridescent lakes limited listenn males marshes mediumsized merlinn mixed north notched note npowered occurs often open panama recordingsncommon shape slightly sometimes species swallow swallows tail underparts variety white widespread wings wintering