Are dolphins the cleverest sea creatures in the sea?

Answer 1

Yes because they can do dancing on water and different tricks i know sea lions can do different tricks but dolphins can do it better and because they are stronger than shark's they kill them with there big beak and they poke it in there necks................................................................

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They can be trained to perform to entertain humans, but that's not necessarily a measure of "cleverness" and although they do frolic by nature, dolphinarium "tricks" are not their natural behaviour.