In the world of birds, where fancy can be as fleeting as flight, the color of the bird apparently has a profound effect on more than just its image. A new study of barn swallows reveals it also ...
Characteristics: A medium-sized swallow, tree swallows have iridescent blue-green upper parts and white underparts. The wings are two-toned, iridescent blue-green and grayer on the trailing edge; the ...
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