National Geographic : 1942 Jun
Ambassadors of Good Will Iridescent Blue Back and Snow-white Breast Mark the Tree Swallow For its home it picks an old woodpecker hole or a cavity in a dead tree or rocky cliff, but many adopt bird boxes. Tree Swallows assemble on telegraph wires in the fall before migrating southward to Florida marshes. © National Geographic Society Kodachromes by Dr. Arthur A. Allen With Fire in Its Eye, the Fearless Vireo Guards Its Young in a Lilac Bush Monotonously all day long during the nesting season, this Red-eyed Vireo, sometimes called "Preacher Bird," calls out "Look up-way up-tree top," etc. During the summer it is found over most of the United States and Canada east of the Rockies, and in winter sojourns from Colombia to Brazil.