Tilly, a river otter, came to the Oregon Zoo in 2009 as an injured and orphaned pup. She birthed four pups while at the zoo.

B lake and Michelle Harrell were hiking along the Brazos River in Waco, Texas searching for river otters when they encountered something just as rare. Sprawled out along the banks of the waterway ...

A zoo euthanized a “beloved” North American river otter after her health declined due to her age, Oregon zookeepers said.

This South American otter is the world's largest, at some 6 feet long. It lives only in the rivers and creeks of the Amazon, Orinoco, and La Plata river systems. These huge members of the weasel ...