A Death Valley pupfish (Cyprinodon salinus salinus) swims in Salt Creek in Death Valley National Park, California. The Death Valley pupfish, which is endangered, is believed to be the only fish species that survived the climate changes that resulted in the present-day Death Valley. Before the last ice age ended, the area was covered in a large lake, called Lake Manly, believed to have supported a large ecosystem of fish. The lake dried after the ice age ended, and the Death Valley pupfish adapted to live in the shallow, hot, saline water now found there.
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