The strange reason dolphins drink at each other

Dolphins get to know their friends by tasting their pee, a new study has found. By taking urine samples from each other, the dolphins demonstrated a kind of social recognition that began with the exchange of whistles that were unique to specific individuals – similar to human names.

Scientists have long known that dolphins are identified by so-called signature whistles, which are different for each dolphin, and that they address each other by imitating such whistles. But researchers were unsure whether this copying showed that dolphins associated characteristic whistles with individual identity or a more general notion of “friend.”

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