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A fish out of the water
The mangrove rivulus, Kryptolebias marmoratus, can spend up to 60 days out of water! This fish is about two inches (five centimeters) long and lives in the marshes of the Caribbean and Latin America. During dry spells, it can survive under damp leaves or in tree hollows. In these conditions, their gills are deactivated, and they breathe cutaneously—through their skin—as long as they remain in a moist environment. Another adaptive feature of this fish is that it is the only vertebrate known to naturally self-fertilize.
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