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The long spines of this urchin were used as chalk on slate boards and so were also referred to as the Slate Pencil Urchin. | ||||||||
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Description • The Red Pencil urchin is large, blunt, pencil-thick spined urchin; often bright red. At night the spines sometimes turn chalky pink! The urchin can grow to 8 inches. Habitat • Found in holes on the reef in shallow waters. Diet •. The Red Pencil Urchin feeds on algae. | ||||||||
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