It has a dark brown coat and a bushy tail. Each pine marten has a unique bib pattern under its chin and down its chest, which can be coloured from an orange-yellow to almost white. They have large rounded ears that stick up from the sides of their heads. A male can be almost twice the size and weight of a female.
Pine martens have a distinctive bouncing run when on the ground moving front feet and rear feet together. They may stop and stand upright on their haunches to get a better view. They are athletic climbers and can hunt and catch red squirrels in trees.