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Rolf Peterson investigating the carcass of a coyote killed by a wolf in Yellowstone National Park, January 1996. Scientists have been researching and studying the impacts on the Yellowstone ecosystem since re-introduction in 1995. As the wolf population in the park has grown, the elk population, their favored prey, has declined.
Greater Yellowstone Area Wolf Pack Territories 2002 (95% MCP except where noted) * A 75% MCP was calculated for these five home ranges because of a high fluctuation in movements.
In recent years, however, Yellowstone's elk population has plummeted. The Northern Herd, the only herd that winters in the park, has declined from nearly 20,000 animals in 1994 to less than 4,000 in 2013. Ecologists have linked this decline to a declining population of cutthroat trout in Yellowstone Lake, caused by invasive lake trout. With ...
The Yellowstone Wolf Project started in 1995 and since it's become one of the most detailed studies of wolves the world. They also focus on studying the day-to-day life and social interactions of ...
The 10,000 year old Grand Canyon of Yellowstone surrounds the mighty Yellowstone River. Gazing from the canyon rim into the 1,000-feet deep gorge should make even the most seasoned traveler feel ...
The recovery of populations throughout the states of Wyoming, Montana, and Idaho has been so successful that on February 27, 2008, the U.S. Fish and Wildlife Service removed the Northern Rocky Mountain wolf population from the endangered species list. [127] As of January 2023, there are at least 108 wolves in the park in 10 packs. [128]
For Yellowstone's dedicated wildlife watchers, a good look or photo of a wolf, grizzly — or especially an elusive wolverine or lynx — makes for a good day in the field.
From these sources, ecologists know the species was common in Greater Yellowstone when Europeans arrived and that the population was not isolated before the 1930s, but is now. Researchers do not know if bears were more or less common than now. A 1959-1970 bear study suggested a grizzly bear population size of about 176, later revised to about ...