The Canaries Had Their Coal Mines

By ANTHONY DePALMA
Published: August 8, 2005

HUNTER MOUNTAIN WILD FOREST, N.Y., Aug. 3 - So far this summer, Wing Goodale and his boss, David C. Evers, have used decoys and recorded bird calls to lure about 150 thrushes, warblers and other wild songbirds into nets here and in several others parts of New York City's Catskill Mountain Watershed to determine what is happening to the drinking water.

From each tiny bird, no bigger than a cellphone, Mr. Goodale, a research biologist, gently takes blood samples with toothpick-size pipettes. Then Mr. Evers, also a biologist, stretches out a bird's wing and counts down to its 11th flight feather, which he deftly plucks and puts into a plastic storage bag for sampling.