I've never seen hermits willingly jump onto an urchin...but our tuxedo urchin routinely picks them up with his "suction feet" and takes them for a ride around the tank until he decides to let them back down. The hermits will be legs out flailing around trying to get down. It's kind of comical to watch.
Well cute as they are, hermits can be killers. I've never heard of them pulling out spines, but nothing would surprise me. I'd get rid of it if it was mine.
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