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

Bottlenose dolphin.

A solitary dolphin in the Baltic Sea appears to be talking to himself, potentially because he's lonely, according to a new study.

Bottlenose dolphins (Tursiops truncatus) are social animals that typically live in pods. But, in September 2019, a solitary dolphin, known as Delle by the locals, started hanging around the Svendborgsund channel, south of Funen Island, Denmark. This area is outside bottlenose dolphins' usual range, and no other dolphins were seen nearby.