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," ...

“Young river otters are extremely dependent on their mothers, and Tilly not only raised her own offspring but three other ...

Of 14 otters released with radio transmitters at Lee’s Landing along the Genesee River in Letchworth State Park, many had left the park’s boundaries within 20 days, according to a progress ...

A “beloved” river otter named Tilly was euthanized in Oregon, zookeepers said. Screengrab from Oregon Zoo A zoo euthanized a “beloved” North American river otter after her health declined ...