> I don't see how a dolphin can be expected to know what a scarf is. Nobody has that expectation. It's possible that dolphins already have sounds associated w

> I don't see how a dolphin can be expected to know what a scarf is. Nobody has that expectation. It's possible that dolphins already have sounds associated with familiar objects (like seaweed), which might interfere with learning a new sound. Hence the use of a foreign object.