They Don't Age!

Hydras, tiny freshwater organisms, are known for their remarkable "biological immortality," as they don’t seem to age in the same way most animals do.

Unlike other organisms, hydras continuously renew their cells through a process of rapid cellular regeneration. Stem cells within their bodies divide constantly, replacing old cells with new ones at a rate that prevents cellular aging or degeneration.

This ability allows hydras to theoretically live indefinitely, provided they avoid injury or disease, making them a fascinating model for studying aging and regenerative biology.