Found in Alaska, Canada and much of the United States, the river otter lives, predictably enough, in rivers. It also inhabits lakes, bayous and marshes, where it typically lives alone, defending its territory from otters of the same sex. Its pelt varies from rich brown to almost black with pale brown on the throat, chin, cheeks and chin. River otters can grow to be 3-4 feet long and may weigh more than 20 pounds, though most are somewhat less rotund. Aided by its webbed toes, a river otter can dive up to 60 feet deep and swim as fast as 7 miles per hour for a quarter of a mile before coming up to breathe.
River otters move across land as well, sometimes traveling to pools with better food supplies in winter. When crossing ice, they bound a few leaps, then slide up to 22 feet before beginning the process anew. Sliding appears to be one of the otter’s principal activities. They are well known for their “otter slides” on riverbanks, down which they slide into the water, apparently for recreation. River otters also den on the bank, using natural openings, animal burrows, hollow stumps, tree roots or brush piles, bearing 2-4 young in March or April. Though they don’t reach sexual maturity until two years, they disperse in their first fall or winter to their own territories.
Though the river otter was once extirpated in much of its range, it has been reintroduced to areas and seems to be thriving. The IUCN lists the species as one of Least Concern, and 29 American states and most Canadian provinces have populations large enough to sustain harvests.May 07, 2012