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Dolphin in the Baltic Sea has been talking to himself — and researchers think it's a sign he's lonely

Live Science
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A solitary dolphin in the Baltic Sea appears to be talking to himself.

Researchers recorded 10,833 sounds over 69 days between Dec. 8, 2022 and Feb. 14 2023 .

Among these noises, the dolphin produced three distinctive whistles.

The findings were published in the journal Bioacoustics .