Maine’s 269 river otter records follow the water, from Acadia National Park’s ponds and rocky shore north to Katahdin Woods and Waters National Monument and Baxter State Park. Hancock County leads the count, but otters turn up across the state, a map of lakes, rivers, marshes, and protected coastline.
A fisherman built for cold water
The river otter is a muscular, web-footed member of the weasel family that hunts fish, crayfish, and frogs underwater, closing its ears and nose as it dives. It needs little more than open water, a bank to den in, and quiet, which Maine provides at places like Sunkhaze Meadows National Wildlife Refuge and along the calmer coves of the coast. Where an otter family travels regularly, worn slides on snowy banks and scent-marked points and logs give it away.
No off season under the ice
Otters stay active all year, traveling over snow and fishing beneath the ice through holes and open springs, so Maine’s calendar shows records in every month rather than a hard seasonal gap. Slight rises in April and August fit an animal that is simply easier to see when waterways open and when grown young begin traveling on their own.
Status in Maine
NatureServe ranks the river otter S5, Secure, in Maine, and the species is native to the state. Once reduced across much of the continent by trapping and degraded water, otters have reclaimed most of their historic range, and USGS NAS does not list them as nonindigenous here.
