Previous studies have focused on land animals including including mammals ... “Almost every big river in North America and Europe is massively modified” through damming, putting freshwater ...

Previous studies have focused on land animals including including mammals ... “Almost every big river in North America and Europe is massively modified" through damming, putting freshwater ...

The playful North American river otter is equally at home in the water and on land. It makes its home in a burrow near the water's edge, and can thrive in river, lake, swamp, or estuary ecosystems.

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