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A Zebrafish Fin

The regrown tail fin of a zebrafish, two weeks after being clipped.
The regrown tail fin of a zebrafish, two weeks after being clipped. Image: Chey Chapman (CC BY 4.0)

Not all of the images were so macro-scale, though. This one depicts the tail fin of a zebrafish, which was clipped two weeks earlier. In that time, the fin was replaced completely. Observations of this regenerative property have been recorded since at least the 18th century, and other animals, like the adorable axolotl, are also known to regrow body parts.

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