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.

Special Rock Pockets For Storage Otters have built-in pockets specifically for carrying rocks. It sounds hard to believe, but loose pockets of skin under their arms allow them to carry tools as ...

That’s where their special pockets and their favorite rocks come in. Researchers have observed sea otters using their chosen rocks in two ways: either as an anvil, placing the rock on their ...

The Oregon Zoo said goodbye to a member of the otter family Wednesday. Tilly, the zoo’s oldest North American river otter, ...

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," ...

We're starting to realize how smart otters really are. They know how to play basketball. They know how to stack cups, They know how to use rocks to open clams. This type of tool use is ...

Tilly, a 16-year-old North American river otter at the Oregon Zoo known for being a mom and having a cameo on the NBC show "30 Rock," died April 30. Tilly was adopted by the Oregon Zoo as a pup ...