The strange reason why dolphins drink each other’s pee

Dolphins get to know their friends by tasting their pee, according to a new study. By taking sips of urine from each other, the dolphins demonstrated a type of social recognition that begins with an exchange of whistles unique to specific individuals – much like human names.

Scientists have long known that dolphins identify each other using so-called signature whistles that are different for each dolphin and that they address each other by mimicking such whistles. But the researchers were unsure whether this copy showed that the dolphins associated the signature whistles with individual identity or with a more general concept such as “friend”.

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