A solo traveler off the coast of Denmark is apparently screaming into the void, revealing the importance of social interactions for dolphins.

The researchers listened in on Delle with an underwater microphone for 69 days, between December 8, 2022, and February 14, 2023. Though they initially weren’t expecting much, the researchers say they detected communicative sounds in 35 out of the 69 days.

"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”.