On the edge of extinction: Tiny pupfish go without breathing to survive their harsh environment

And you thought you could hold your breath for a long time. Enter the desert pupfish, a tiny fish that has been playing evolutionary catch-up due to the extreme changes in its environment over the last 10,000 years. The shrinking scope of its natural habitat has caused the pupfish to adapt in a surprising way—it essentially goes without oxygen for up to five hour stretches.

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