Death Valley pupfish

The Death Valley pupfish (Cyprinodon salinus) is a species of fish that is the last known survivor of what is thought to have been an large ecosystem of fish species that lived in Lake Manly which dried-up at the end of the last ice age leaving the present day Death Valley in California. This fish is adapted to the shallow, hot, salty water of a particular part of Salt Creek that flows above ground year-round. A sub-species—Cyprinodon salinus milleri—lives in nearby Cottonball Marsh.