Animals & Birds Articles

What animals are immortal? While true immortal animals are rare, some animals come surprisingly close. From the 500-year-old ocean quahog and centuries-old Greenland shark to hydras and planarians that can continually regenerate, these biologically immortal animals challenge what we know about aging. Discover how these remarkable creatures survive for centuries, resist aging, regenerate their bodies, and, in one case, even reverse their life cycle.