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Brown in color, the American mink has a long slender body enabling it to enter the burrows of prey. Its streamlined shape helps it to reduce water resistance while swimming.
Spotted at the edge of a back water slough at the Billy Frank Jr. Nisqually National Wildlife Refuge.
The American mink relies heavily on sight when foraging. Its eyesight is clearer on land than underwater. Its auditory perception is high enough to detect the ultrasonic vocalisations (1–16 kHz) of rodent prey.