Things You'll Need
- Scale
- Measuring Tape
Instructions
Measure the length of the fox. Adult male red foxes are typically 54 to 78 cm in length. Females are 56 to 74 cm in length.
Weigh the foxes. Females are 4 to 4.5 kg in weight, and males are 4.5 to 5.4 kg. Also, males tend to have broader heads with longer, narrower snouts than females.
Look at fox genitalia. This is the surefire way to tell the difference between male and females. Males have a penis sheath; it is small but you will recognize the absence of one in the female, if you see the male. The female's genitalia is called the mammae, and is difficult to see through her fur.