There are hundreds of urchin species, and they’re found in every ocean on Earth, from the intertidal zone to more than four ...

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 ...

Harvesters are limited to 1,500 pounds of green sea urchins per week during the season; fishing closes when the quota for a particular area has been reached. Quotas for red sea urchins are higher.

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 ...