MAMMALS

River Otter, Lontra canadensis

Family Mustelidae (Mustelids)

Size/Weight: approx. 4' long with tail; approx. 20 lbs.

Range: Throughout the United States except parts of the southwest and midwest

Habitat: Areas near streams, lakes, or estuaries

The river otter is a large, curious, and playful mustelid with a mostly aquatic lifestyle. It is elongate and sinuous, with small ears, webbed feet, and a long, somewhat thickened tail to aid in swimming. Its fur is thick, dark brown above and pale gray below and across the lower face. River otters are social and often travel in small family groups. They hunt primarily in the water for fish, amphibians, or aquatic invertebrates. They live in burrows near water and form well-used trails along the shore or between water sources.

Track size (front): 2½" wide x 2¾" long

Track size (rear): 3" wide x 3¼" long (not including heel)

Description of Track: The rear foot is noticeably larger than the front. There are five toes on each foot, with extensive webbing between the toes, being most evident on the rear foot. The claws are short and may or may not register. The metacarpal pads are fused in a loose arc shape, with an additional proximal pad in the front foot and a faint heel impression on the rear. The sole is not heavily furred. There is often noticeable tail drag between the tracks, and long, deep impressions where otters have decided to slide, especially downhill.