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= Douglas H. Chadwick = Douglas H. Chadwick (born 1948) is an American wildlife biologist, author, photographer and frequent National Geographic contributor. He is a past officer and member of the board of The Vital Ground Foundation, and chairman of that organization's Lands Committee, responsible for choosing acquisition properties as part of the Yellowstone to Yukon wildlife corridor system.

Single Species Studies
Chadwick's research involves multi-year projects of extended close observation in species habitat, trapping, radio collar tracking, mapping, and studies of community relationships. In this manner, he has studied wolverines in the northwestern U.S. and Canada, mountain goats and grizzlies in the Rockies, and elephants in Africa.

Wildlife Corridors
In his work for Vital Ground, Chadwick evaluates potential corridor lands to link the five protected grizzly bear habitats in the lower 48 states and British Columbia and Alberta in Canada. He has guided land and easement acquisitions in, for example,the Cabinet-Purcell Wildlife Linkage Initiative Area, the Selkirk Initiative , and the Bismark Meadows in Idaho.