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.
You may find them sleeping face down across the edge of a box with their heads and front legs on the floor. Or you may see them sleeping on their stomachs with their hind legs and tails bent at a 90-degree angle up the side of a box. Ferrets often sleep together for comfort as well as warmth. Ferrets are susceptible to the common cold and several strains of human influenza. Ferrets have one central artery in the neck.