Their throats are pale buff with black tails and legs. Two vertical black lines run above the inner corners of their eyes. In winter, long hairs grow between the toe pads on their feet, similar to the snowshoe hare . Thick fur helps keep their feet warm and helps them travel long distances on snow. Pine martens have long, bushy tails, one-third the length of their body.
Fishers live in similar habitat, have similar tracks and are darker in color than pine martens.
Stone martens are non-native species and are also about the size of the male pine marten. They are pale gray to brown with a white throat patch. They'll pursue prey, red squirrels or chipmunks, up a tree and may climb trees to escape danger. Martens move across the ground in a zig-zag fashion, then take a series of jumps. They're solitary but curious animals.