Affectionately named Delle, a male bottlenose dolphin, has become an unexpected resident of the Baltic Sea, far from his species’ usual warm and bustling habitats. His unusual presence near Denmark’s Svendborgsund channel has intrigued marine biologists and captivated local communities,

When you are alone, especially for long periods of time, do you talk to yourself? If so, you’re in interesting company because a male Atlantic bottlenose dolphin who has been living alone in the Baltic Sea for more than three years, appears to be talking to himself.

Marine biologists are perplexed by the lone bottlenose dolphin's vocalizations, because some resemble sounds typically used for communication