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Black-throated blue warbler (top left), yellow-rumped warbler (top right), and black and white warbler (bottom) are typical of migratory songbirds which show a decline of DDT and metabolites for the decade 1964-1973. See page 841. [Samuel Grimes, Jacksonville, Florida]


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Science. ISSN 0036-8075 (print), 1095-9203 (online)