The tecopa pupfish had a very small range–two small springs in the Amaragosa River in California’s Death Valley–but it was ultimately human activities that brought about its extinction. A rare creature able to tolerate salty, hot water (up to 110 degrees!), the pupfish went extinct after its two springs were channelized for use in bathhouses. Channelization induces faster flowing water, which the pupfish could not tolerate. Competition with introduced species placed further stress on its endangered population, and the pupfish was officially declared extinct in 1981.
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