On today’s dive, we found a red sea urchin—safe to touch, but we returned it to its home. And to top it off, we met my turtle friend underwater! #SeaUrchin #TurtleFriend #UnderwaterDiscovery ...

That’s roughly 17,000 times larger than the rougheyed rockfish and 250,000 times larger than the red sea urchin (seen below). Longevity has been estimated at over 200 years by measuring changes in the ...

As the red sea urchin ages, it regenerates damaged parts infinitely. It never really dies. “These red sea urchins appear to be practically immortal," Thomas Ebert, a marine zoologist at Oregon ...