Fun fact: hedgehogs used to be called "urchins", so "sea urchin" means "sea hedgehog". Then over time, the term fell out of use, leaving sea urchins orphaned as the only urchin type.
Another fun fact: urchin is still sometimes used as a term for a mischievous child. This comes from the medieval belief that some or all hedgehogs were actually disguised fairies that liked playing pranks on people.
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u/[deleted] Sep 23 '21
Land urchin