Here's the sea urchin 101. Everything you need to know about these spiky echinoderms. Sea urchins (Echinoidea, regular urchins, porcupines of the sea). Sea urchin facts! They are even featured in Animal Crossing.

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References and Helpful Links
https://www.whoi.edu/science/B/people...
https://www.sciencedirect.com/topics/...
https://oceanservice.noaa.gov/news/ma...
https://www.smithsonianmag.com/smart-...
https://www.news.ucsb.edu/2019/019538...
http://museum.wa.gov.au/research/coll...
http://www.polarlife.ca/organisms/inv...
https://ucmp.berkeley.edu/echinoderma...

Sea Urchins: Biology and Ecology. Netherlands, Elsevier Science, 2013.

Rustad, Martha E. H.. Sea Urchins. United States, Bellwether Media, 2010.

Hawai'i's Sea Creatures: A Guide to Hawai'i's Marine Invertebrates. United States, Mutual Pub., 1998.
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Videos Licensed Under Creative Commons/Public Domain
JekelyLab    • Pluteus larva  
   • A baby sea urchin trying out its arms  
Jon Bondy    • Sea Urchin Walks On Glass  
Maggie Koerth    • Spines of a sea urchin (magnified)  
   • Baby sea urchin's first cell division  
DM289169 / CC BY-SA (https://creativecommons.org/licenses/...)
https://upload.wikimedia.org/wikipedi...
Jason Antic    • White Sea Urchin Swarm  
The Dish on Science    • Munchy Sea Urchin  
Crejk    • Sea urchin teeth  
NOAA    • Okeanos Explorer Video Bite: Urchin i...