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.

Tilly, a 16-year-old river otter at the Oregon Zoo known for being "Mom of the Year" and a cameo on the NBC show "30 Rock," died April 30.

A pair of North American river otters at the New Zoo Adventure Park in Green Bay, Wisconsin, decided to take an unauthorized field trip during a snowstorm. The otters, named Louie and Ophelia ...

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

Oregon Zoo is mourning the death of their famous river otter, Tilly, at the age of 16. She won the zoo's “Mom of the Year” ...

A “romp” of otters was spotted in Sertoma Park. Officials say the animals often live in close-knit family groups and that their playful interactions are vital to their development and survival.

"You know, just seeing one dead river otter is a lot for us. It's not very common. But to see four in one place," said Executive Director Doris Duncan. "All four of them were males. They were very ...

Zoo staff euthanized the 16-year-old otter Tilly, who had a cameo on NBC's '"30 Rock," following a decline due to her age, the Oregon zoo 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 ...

But not the river otters. As researcher Graham Duggan discovered, “they appear to enjoy the winter and its cold temperatures and delight in the snow and ice on the frozen waterways.” ...