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 ...
Watch this clever sea otter trade its prized sea pebble for a fish, then read all about how clever these creatures are.
Add Yahoo as a preferred source to see more of our stories on Google. Sea otters are highly intelligent marine creatures. Their intelligence is shown by their inquisitiveness and their use of tools.
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