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urchin
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giant purple sea urchin
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Sea otter (Enhydra lutris), also called great sea otter, rare, completely marine otter of the northern Pacific, usually found in kelp beds. Floats on back. Looks like sea otter laughing. saltwater otters
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giant purple sea urchin
giant purple sea urchin Giant purple sea urchin (Strongylocentrotus purpuratus).

urchin

echinoderm
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History

urchin, any of several marine invertebrates of the class Echinoidea (phylum Echinodermata), including the cake urchin, heart urchin, and sea urchin (qq.v.).

This article was most recently revised and updated by Amy Tikkanen.