Canada Warbler in Flight, Great Spruce Head Island, Maine, June 29, 1963

Yellow Warbler, Female, Battle Creek, Michigan, June 25, 1947

Yellow Warblers, Male and Female, Great Spruce Head Island, Maine, July 7, 1971

Yellow Warblers, Male and Female, Great Spruce Head Island, Maine, July 7, 1971

Canada Warbler in Flight, Great Spruce Head Island, Maine, June 29, 1963

Yellow Warblers, Male and Female, Great Spruce Head Island, Maine, July 7, 1971

Yellow Warblers, Male and Female, Great Spruce Head Island, Maine, July 7, 1971

Yellow Warbler, Male, Union City, Michigan, June 6, 1955

Violet-green Swallow, Aspen Basin, New Mexico, July 6, 1952

Loggerhead (White-rumped) Shrike, Santa Fe County, South of Santa Fe, New Mexico, May 27, 1948

Loggerhead (White-rumped) Shrike, Santa Fe County, South of Santa Fe, New Mexico, June 23, 1951

Black-and-white Warbler, Female, Great Spruce Head Island, Maine, June 21, 1971

Western Warbling Vireo, Tesuque, New Mexico, June 20, 1950

Arctic Tern, Matinicus Rock, Maine, 1976

Black-and-white Warbler, Male, Great Spruce Head Island, Maine, June 21, 1971

Black-and-white Warbler, Great Spruce Head Island, Maine, June 21, 1971

Black-headed Grosbeak, Male, Aspen Valley, New Mexico, July 2, 1951

Bullock's Oriole, Male, Los Luceros Ranch, Alcalde, New Mexico, June 19, 1951

Pyrrhuloxia, Female, San Xavier Indian Reservation, Arizona, June 3, 1952

White-throated Sparrow, Male, Great Spruce Head Island, Maine, June 17, 1964