How do you sex an otter?

To determine the sex of an otter, you can look for physical characteristics. Males are generally larger than females and have a more robust build. Additionally, the presence of external genitalia can be observed; males have a noticeable penis sheath located near the base of the tail, while females have a vulva located further up the abdomen. In some cases, observing behavior, especially during mating season, can also provide clues to their sex.