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The Devil's Hole pupfish lives in just a single tiny desert pool in Neveda.

Red handfish use their hand-like fins to "walk" across the seafloor instead of swimming.

The Chinese paddlefish was one of the largest freshwater fish before it was declared extinct. 

Sakhalin sturgeon are critically endangered and are among the rarest sturgeon species in the world. 

Longnose chimaeras are deep-sea relatives of sharks and rays with long, pointed snouts.