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Tripneustes gratilla

These Sea Urchins Have a Terrifying Self-Defense Strategy

Some urchins are poisonous to humans as well as fish. Be careful when dealing with the various species as getting stuck can cause a lot of pain and in some cases hospitalization. The urchin in this story is part of a larger group called "collector urchins" because they camouflage themselves by sticking things on their back. The Tuxedo Urchin is an example of this group. This new discovery is quite...
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