Assertion: deep diving otter | /r/HasProperty | done on urchin
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Source sentences:
text: The otters, which need to consume 25 to 35 percent of their body weight every day to maintain metabolism, are divided into three “dietary guilds”: deep-diving otters done on abalone, urchins and Dungeness crab; medium divers eat clams, worms and smaller shellfish; and shallower dwellers consume black snails.