Odd Fish that Can Live in a Log.

The rivulus is notorious for being the only fish that can naturally self-fertilize and is also known to breathe air for long periods of time. However, scientists accidentally discovered that this odd American fish can live in logs while breathing air for months at a time, a behavior they now call "logpacking" since many rivulas will pack together inside a single log. Link [National Geographic News]

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I did my master's thesis on these little guys a while back. Since they liked living in dark tubes, we were able to place them in test tubes and put them in an NMR spectrometer to check out their metabolism without stressing them too much. They are neat little fishes.
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