Biologists with the Yellowstone National Park wolf project attach GPS collars, take blood samples, and collect other data as they care for tranquilized wolves from the Mollies pack in the park's Pelican Valley. The team's wolf capture and GPS collaring allows the biologists to integrate knowledge of the animals' life histories, genetics, and predatory influence on Yellowstone National Park's dynamic ecosystem. From left to right are Dan Stahler @dstshahler, Erin Stahler @erin.stahler, and Doug Smith. 2015 marks 20 years since the reintroduction of wolves into the Greater Yellowstone Ecosystem. iPhone photo by David Guttenfelder @dguttenfelder on assignment for @natgeo.
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