Yellowstone Science: Past Issues

Fisheries biologist introduce native trout to a mountain stream.

Native Fish Conservation

Native cutthroat trout are the most ecologically important fish of the park and the most prized, and highly regarded by visiting anglers...

Wolves and bison in a standoff in the winter sun.

Celebrating 20 Years of Wolves

After a 70-year absence, 41 wolves from Canada and northwest Montana were reintroduced to Yellowstone National Park between 1995 and 1997.


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Last updated: September 16, 2019


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