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"Porpoises communicate with narrow-band, high-frequency clicks, known to those in the clicking cetacean business as NBHF clicks. Dolphins on the other hand like to swim around whistling, a sound porpoises never make.

Upon reviewing the recordings, the researchers realized Kylie “definitely identifies as a porpoise,” National Geographic reports co-author on the paper David Nairn, who studies porpoises in the area, said. Not only did Kylie not whistle like other dolphins, but even when alone she could be heard using sounds that resembled the NBHF clicks associated with porpoises.

Furthermore, communication between Kylie and the porpoises had a rhythm indicative of a conversation, though exactly how much information is portrayed in these chats is unclear."
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