Crown-of-thorns starfish

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A crown of thorns starfish
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A crown of thorns starfish

The Crown-of-thorns starfish (Acanthaster planci) is a special sea star. Usually it is red. Most sea stars have appendages that look like arms. This one has thorns instead. like other sea stars it can grow arms as well. Usually it grows between 11 and 19 of them. It feeds on coral polyps.

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