In 2025, scientists observed snails regenerate what body part in just one month?

In 2025, scientists made a remarkable observation: freshwater apple snails can completely regrow their eyes in just about one month. This incredible regenerative ability was detailed in a study published in Nature Communications, highlighting the speedy and precise nature of this biological feat. Researchers found that after an eye was amputated, a new, fully formed eye, complete with all its anatomical features, was restored in roughly 28 days.

What makes this discovery particularly intriguing is the surprising similarity between the apple snail's "camera-type" eyes and human eyes. Both possess a cornea, a lens, and a retina, suggesting a shared evolutionary heritage despite the vast differences between species. Understanding how these snails accomplish such complex regeneration could provide invaluable insights into treating human eye injuries and degenerative conditions, as our own eyes are largely incapable of self-repair. Scientists have even identified a crucial gene, pax6, which is essential for eye development in both snails and humans.

The regeneration process in apple snails unfolds in several distinct phases. It begins with rapid wound healing within 24 hours to prevent infection. Following this, unspecialized cells migrate to the affected area and begin to proliferate, forming a special cell mass. Over approximately a week and a half, these cells differentiate and start to construct the new eye's structures, including the lens and retina. While all major components are present by about two weeks, the new eye continues to mature for several more weeks until it is fully restored. This natural blueprint for rebuilding a complex sensory organ offers a hopeful avenue for future regenerative medicine.