Author Susan Benton

Go to the bottom of any page and click on Strange Facts Archives in the site map, to read all previously posted Strange Facts.

Sea urchin

You might think of a sea urchin as the pincushion animal of the sea world. But the California purple sea urchin might be much more than that. With more than 1400 tube feet, each tipped with a protein critical to invertebrate vision, some regard this sea urchin as a crawling eyeball.

Opsins are proteins found in the photoreceptors of the retinas of humans and other animals with complex eyes. The purple sea urchin is equipped with light-sensitive r-opsins. And while the sea urchin does not have an eye, some scientists feel it IS an eye.

Click on the link below to LEARN MORE.

(Photo:By David Monniaux [GFDL (http://www.gnu.org/copyleft/fdl.html), CC-BY-SA-3.0 (http://creativecommons.org/licenses/by-sa/3.0/) or CC BY-SA 2.0 fr (https://creativecommons.org/licenses/by-sa/2.0/fr/deed.en)], from Wikimedia Commons)

IF YOU WANT TO SUBMIT A STRANGE FACT, CLICK ON CONTACT. KID-FRIENDLY FACTS ONLY! NO RUDE OR CRUDE, PLEASE. CREDIT WILL BE GIVEN WITH USER NAME OR FIRST NAME ONLY.

LEARN MORE...

Link...Livescience

Images/Sea urchin book

BOOKS

SEA URCHINS by Jody S. Rake

(Click on the book jacket to buy now.)