שאלה | When dolphins were tested for whistle-recognition, what were the results?

When dolphins were tested for whistle-recognition, what were the results?

		Even when the signature whistle was stripped of natural acoustic features, the dolphins recognized the whistle pattern of their close relatives
		When the signature whistle was stripped of natural acoustic features, the dolphins did not recognize the whistle pattern of their close relatives
		The dolphins did not show a preference for the signature whistles of close relatives in relation to distant relatives and acquaintences
		Dolphins did not recognize other dolphins' voice in isolation, or the whistle pattern in isolation, but only a combination of both