sea ​​urchin

Sea urchin

sea ​​urchin

Chinese name:海胆

Sea urchin is a kind of invertebrate, with a delicate hard shell covered with many spines, called spines. The shapes of sea ​​urchins are spherical, heart-shaped and pie -shaped. They live in the oceans of the world, among which the Indian Ocean and Western Pacific Ocean have the most species.

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