Discover Delle, a lone bottlenose dolphin in the Baltic Sea, whose unique vocalizations captivate scientists and locals.

Marine biologists from the University of Southern Denmark heard about Delle and noticed a unique opportunity to listen to sounds made by an isolated dolphin in the wild. When they dropped a microphone in the area where Delle traveled for several months,

Delle might possibly be the loneliest dolphin in the world, spending his time adrift from other members of his species and desperately chatting to himself to pass the time

"If we hadn't known that Delle was alone, we might have concluded that a group of at least three dolphins was engaged in various social interactions”.