Track 3 1/4" (80 mm) wide or more; often show only heel pad and claws. Toes fan out widely, but webbing rarely prints, except in mud. Running stride 12–24" (300–600 mm).
Sign Slides: The most obvious and best-known evidence of otters; may be of ice and snow or mud. Riverbank slides 8" (200 mm) wide, much wider with heavy use. Snowslides 12" (300 mm) wide or wider, up to 25' (7.5 m) long; often on flat ground, sometimes pitted with blurred prints where otter has given itself a push for momentum.
Rolling places: Areas of flattened vegetation up to 6 1/2' (2 m) wide, with twisted tufts of grass marked with musk and sometimes droppings.
Haul-outs: Trails from the water, often containing crayfish parts and droppings.
Scat: Irregular, sometimes short, rounded segments, sometimes flattened masses, containing fish bones, scales, or crayfish parts; when fresh, often greenish and slimy. Scat most often found on banks of stream or pond, on logs, or on rocks in water.
Trail: Meandering, about 8" (200 mm) wide, between neighboring bodies of water or other favored spots, such as rolling areas or slides. Trail may show sidling walk. Sometimes makes rough trough through loose snow or plunge holes in snow when fleeing a predator.