River otter Washington Department of Fish & Wildlife

It felt like knives going in': Hunt in Washington for vicious otter that mauled grandmother, 8-year-old grandson – New York Daily News

UW Researchers Study How to Improve Southern Sea Otters' Chances of Survival - SweetwaterNOW

Protection of Northern Sea Otters in Washington

Otters moving into North Idaho in increasing numbers - and not the gubernatorial kind

Bees, Birds & Butterflies: River Otters Feast on Salmon at Capitol Lake

You Otter Know: The Difference Between Sea and River Otters, by USFWS Columbia Pacific Northwest Region, USFWS Pacific NW Region

Counting Wild Sea Otters - Point Defiance Zoo & Aquarium

River Otters - PAWS

Northern Sea Otter Species Profile, Alaska Department of Fish and Game

PNW Paddling & Common Animal Sightings

River Otters Play in the Valley Again - Scenic Hudson

Counting Wild Sea Otters - Point Defiance Zoo & Aquarium

North American River Otter Missouri Department of Conservation