Scientists studying Amazon river dolphins in Brazil have observed males spraying urine into the air, a ritual for communication.

Scientists suggest that the bristles on the dolphins' snouts help them 'decode' messages in other dolphins' urine.

“For river dolphins, echolocation, or biosonar ... “With this fossil record unearthed in the Amazon, we expected to find close relatives of the living Amazon River dolphin – but instead ...

When this inland sea retreated, Hamilton hypothesizes, the Amazon dolphins remained in the river basin ... the way in tight spots), and small eyes—echolocation helps them pinpoint prey in ...

But their evidence wasn’t collected from the water—it could be seen from shore. After around 219 hours of observations, they can confirm that male Amazon river dolphins (Inia geoffrensis), also known ...