A solo traveler off the coast of Denmark is apparently screaming into the void, revealing the importance of social interactions for dolphins.
A dolphin dubbed Delle appears to be talking to himself in the Baltic Sea’s Svendborgsund channel off the coast of Denmark. According to a team of researchers that recorded Delle, the solitary dolphin may be so desperate for social connection that he’s thinking out loud.
Delle was first spotted in the Baltic channel five years ago, and was noticeable because he was the sole dolphin in the area and didn’t belong to a pod. The researchers lowered a microphone into the water and recorded Delle’s sounds from December 2022 to February 2023—a total of 10,833 voicings. The noises included clicks, whistles, and bursts of sound often linked to aggressive interactions among dolphins.
Though those sounds are sometimes made to reconnect with other individuals, the research team doesn’t think it was the case with Delle; the animal had already been in the channel for about three years when it was recorded, more than enough time to determine that there were not other dolphins in the area.
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