how long can this creature live underwater?
4 minutes
North American river otter
North American river otters can remain underwater for nearly 4 minutes, swim at speeds approaching , dive to depths nearing , and travel up to while underwater. 
where do river otters live in the winter They travel drastically less during winter. is this creature a mammal, reptile, amphibian, or any other? Mammal
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North American river otter [SEP] Hunting
A highly active predator, the North American river otter has adapted to hunting in water, and eats aquatic and semiaquatic animals. The vulnerability and seasonal availability of prey animals mainly governs its food habits and prey choices. This availability is influenced by the following factors: detectability and mobility of the prey, habitat availability for the various prey species, environmental factors, such as water depth and temperature, and seasonal changes in prey supply and distribution in correspondence with otter foraging habitat.