The Sea Otter is the heaviest member of the weasel family and one of the few non-primate mammals known to use tools, cracking shellfish open with rocks while floating on its back. It has the densest fur of any mammal—up to one million hairs per square inch—which traps air for insulation since it lacks blubber. Sea otters are a keystone species in kelp forest ecosystems, controlling sea urchin populations.
Best time to see a Sea Otter
The best time to see a Sea Otter is March–August, when about 62% of U.S. sightings happen, based on 15,296 research-grade iNaturalist observations.
Not certain it is a Sea Otter? What animal is this? walks through what to check first and the lookalikes that catch people out.
Recent Sea Otter sightings near you
Live, research-grade observations from iNaturalist. Allow location to center the map on you.
Spot a Sea Otter? Identify it instantly.
Point Huck at any plant, bird, or animal for an instant ID, its rarity, and a live map of where it is being seen near you.
Get HuckGet an alert when a Sea Otter is spotted
Pick a park, state, or city and we’ll email you when one turns up there. One check a day, only when there’s something new.
Free. Unsubscribe from any email. See our Privacy Policy.
Love mammals? Get Huck field notes
Spotting tips, new species, and the best of what people are finding in the wild - straight to your inbox.