Blue-green Warbler

Blue-green Warbler [now Cerulean Warbler]
Sylvia rara [now Setophaga cerulea]
Folio edition, plate 49

“The Blue-green Warbler has a peculiar cunning manner of leaning downwards to view a person, or while searching for an insect, and which is very different from that of any other bird. . . . While catching an insect on the wing, it produces a slight clicking sound with its bill, and in this respect approaches the Vireos. Like some of them also, it descends from the highest tops of the trees to low bushes, and eats small berries, particularly towards autumn, when insects begin to fail.”

John James Audubon, Ornithological Biography, or An Account of the Habits of the Birds of the United States of America (Edinburgh: A. Black [et al.], 1831), vol. 1, p. 258.

View bird in National Audubon Society Guide to North American Birds.