MIKE SIEGEL / THE SEATTLE TIMES
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Spreading suburbs lure birds of a different feather
University of Washington biologist John Marzluff blows on the belly of a spotted towhee to see if she is incubating eggs in a nest. The telltale sign is a brood patch, an area of skin engorged with blood to warm her eggs. After tagging her and checking her health, Marzluff set the bird free.