The greater threat, he said, produces no smoke. This threat, found now in Yellowstone's lakes, along its hillsides and in its plant communities, are the non-native species brought in by fishermen or carried in by muddy shoes and boots. Lake trout, dumped illegally in Yellowstone Lake years ago, are eating the cutthroat trout, which for thousands of years provided food for park osprey, eagle, otters and bear. The face of the West is being changed by these exotics, Seibert said. They have no predators and aren't used for grazing.
Fire certainly belongs.
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