The Devils Hole pupfish is regarded as the rarest fish globally. It is a small, blue fish residing in two pools in the Mojave Desert. The first is the real Devils Hole, a geothermally heated natural pool, while the second is a constructed replica designed to mimic the real pool. Created by the United States Fish and Wildlife Service to protect the species from extinction, the replica has recently succeeded in housing a greater population than the original pool, highlighting the species' precarious situation.
The Devils Hole pupfish is often described-probably accurately-as the "rarest fish in the world." The fish is about an inch long and sapphire blue.
The real Devils Hole is a pool of exceptionally clear, geothermally heated water found at the bottom of a limestone cavern in the Mojave Desert.
The fake Devils Hole was constructed by the United States Fish and Wildlife Service, after the population of pupfish in the real pool dropped to a mere thirty-five individuals, in 2013.
More Devils Hole pupfish live in the mock Devils Hole than in the actual one.
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