Why can’t people regenerate limbs like salamanders?

Image caption: Salamanders like axolotls are champions of regeneration. Image credit: Magnific. Article by Junsu Kang. The Conversation – October 5, 2026.

Imagine losing an arm and simply growing a new one. This amazing ability of regeneration isn’t just something from a superhero movie – it actually happens in real life for some animals. Salamanders are known as champions of regeneration. If a salamander loses a leg, it can regrow another one, complete with bones, nerves, blood vessels and muscles. Some fish are impressive regenerators too. Zebrafish – small, striped fish that scientists often use to study human diseases – can regenerate injured fins. Even more surprisingly, they can repair damaged parts of important organs such as their heart and brain. Why can these animals regenerate while people cannot? […]

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