Amazon River Dolphins Communicate Through 'Pee Fountains'

New research reveals Amazon River dolphins (Inia geoffrensis) communicate using a peculiar behavior: aerial urination. Male dolphins eject urine into the air, and nearby males frequently approach these 'pee fountains,' suggesting the urine conveys information about social status or physical condition. This adds to the growing body of evidence showing the diverse ways animals use urine to communicate, from primates using it for individual recognition and mate finding, to fish and crustaceans using it to signal size and aggression. The study highlights the underappreciated role of olfactory communication in the animal kingdom.