Dolphins are so intelligent that they can learn to speak a second language while they are sleeping. Soon, they may even give professional translators stiff competition for their jobs!

Within the last week, scientists have recorded captive dolphins in the French town of Port-Saint-Père sleep talking. But bizarrely, as they were sleeping, the marine mammals were not making dolphin sounds, but whale-like noises.

Péos, Mininos, Cécil, Teha, and Amtan, were all born in captivity. However, they have heard whale sounds as a recording, the Daily Mail reports. But researchers say that if the sounds are confirmed to be whale, it would be the first known instance of dolphins learning a noise and repeating it later.

The dolphins have only ever heard a whale sing on the soundtrack to their daily shows at the French water park Planète Sauvage. However, the dolphins have not been known to mimic the whale song during or after performances.

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