mature male otter weighs 10-25 pounds and is 30-40 inches
in length, plus a 12- to 15-inch tail. Females are slightly
smaller. An otter is muscular, streamlined and solidly built,
somewhat like a dachshund; height at the shoulder is about
10 inches. An otter's tail is long and tapered, thickest
where it joins the body and furred its entire length. The
face is broad, and the eyes protrude slightly.