Scientists have discovered why Amazonian dolphins release streams of urine into the air

Male Amazon river dolphins were observed doing something unusual. The mammals rolled over on their backs and shot a stream of urine into the air for up to 90 centimeters, while their peers, watching this, approached the place where the stream fell.

Researchers from Canada, having analyzed hundreds of hours of video recordings, came to the conclusion that males can use the bristles on the rostrum (the front part of the snout formed by the jaws) to analyze the hormonal composition of urine and the health of their peers.

That is, this conscious action of Amazon dolphins may have a social or communicative meaning - by analogy with the behavior of land animals, such as cats, dogs or bears, who use urine for communication.