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

There’s the South Asian river dolphin (Platanista genus) and the Amazon river dolphin (Inia genus ... seeking less competition for food. This Amazonian freshwater environment was nutrient ...

Amazon river dolphins are showing alarming levels of contamination ... of deforestation and forest fires and slipping into the food chains of dolphins and fish,” said Oliveira.

The fossilized skull of a now extinct giant river dolphin was discovered in the Amazon River ... groups that originally left oceans to find new food sources in freshwater rivers.” ...