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” ...

Here's what to know about Tilly. At 16, Tilly was the oldest member of the zoo's North American river otter ...