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Backyard bird study. Paintings by naturalist Henry Smith Williams (1863–1943) depicting his decade-long observational study, wherein seven species, such as (left to right) orioles, flycatchers, robins, and waxwings, adopted the use of coloured strands of yarn for nest construction. Reproduced with permission by Natural History, November 1934 Copyright © Natural History Magazine, Inc., 1934.
