Residents of the Great Lakes are up to their eyeballs in invasive zebra mussels. Why not? Well, Europeans introduced rabbits to Australia for food and hunting in the 18th and 19th centuries and the rabbits overran the place. But they admit that's a roll of the dice that violates a basic rule of conservation: If you want to keep the natural world "natural," you don't want to move plants and animals around willy-nilly. Species that can't migrate may perish, so some biologists say we need to move them. Something unusual is happening in America's wilderness - some animals and plants are moving away from their native habitats. ![]() By moving more than 100 fish to higher elevations, fisheries scientists hope to save the species by seeding a new population in waters that will stay cooler longer. ![]() ![]() Bull trout are running out of time in Montana as their traditional waters heat up, biologists say.
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