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Otter vs. Seal: What's the Difference? - SeaQuest
How to Tell the Difference Between Sea Otters and River Otters - Ocean Conservancy
The River Otter Ecology Project - Sea Otter, River Otter? Sea otters weigh 65 or more pounds (the size of a German shepherd) while river otters only weigh about 15 or so
Northern Sea Otter Species Profile, Alaska Department of Fish and Game
Sea Otters VS River Otters! What's the Difference?
Otters – Cowichan Estuary Nature Centre
River Otters vs Sea Otters - The Homeschool Scientist
Sea otter - Seattle Aquarium
River otter - Seattle Aquarium
River Otters Vs Sea Otters: What's the Difference? - American Oceans