CNN — When sea otters hammer mussel shells against rocks to help open them, they're leaving behind their own archaeological record that can't be compared to any other creature, according to a new ...
A southern sea otter with a purple sea urchin in Monterey Bay, California. (Credit: Morgan Rector) (CN) — Sea otters are voracious eaters, munching away on shellfish, urchins and other invertebrates ...
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