They are no vegetarians
Ferrets are strict carnivores, which means that they eat mostly animal proteins and fats. To stay healthy, they require a high-protein diet rich in vitamins and minerals. Raw meat, eggs, insects, fish, liver, and heart are all common ferret foods.
However, they can benefit from occasional treats such as fruits and vegetables. But be careful! They should be given fruits and vegetables in moderation because they lack the enzymes required for efficient plant digestion.