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Yellowstone National ParkA Grizzly Bear sow keeps careful watch over her two cubs.
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Yellowstone National Park
Yellowstone National Park Historian

Yellowstone’s historian, Lee Whittlesey, is available to researchers during his office hours, Monday-Friday, 8am-5pm. Please contact Mr. Whittlesey in advance at (307) 344-2261 or via email at e-mail us
Lake Trout Illustration  

Did You Know?
Lake trout are an invasive species of fish that is decimating the native cutthroat trout population in Yellowstone Lake.

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Last Updated: April 17, 2007 at 12:52 EST