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Earth Week: Whither Yellowstone's willows and the streams they shade?
Willow catkin with dew in Yellowstone. Willows there and elsewhere depend upon a supply of water.
Credit: NPS
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Elk browsing on willows in Yellowstone; Do elk or does water limit the growth of willows?
Credit: NPS
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An old lake bed in Yellowstone. Willows grow along its wet edges.
Credit: NPS
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Researchers working on Yellowstone's northern range clip willows as part of the study.
Credit: Tom Hobbs
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What is the true role of elk in Yellowstone's ecosystem?
Credit: NPS
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At the center of Yellowstone: elk, willows, water, wolves--or all of them?
Credit: Wikimedia Commons
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