Ferrets have keen senses of hearing, smell and touch. Ferrets can be trained to discriminate objects. Ferrets have poorly developed sweat glands. Ferrets have 14 pairs of ribs. By nine weeks, the difference in size between males and females is evident.
Ferrets are carnivores and require a diet high in protein and fat.
The thickness and length of a ferret's hair changes during the year. During the winter, ferrets tend to have a fuller coat, and during the summer, their coats thin out. Mask markings and color may change with season and age. Ferrets sleep between 15 to 20 hours a day. Ferrets sleep in strange positions.