This black and white with tone illustration is used by veterinarians to show the normal anatomy of the ferret, as well as the common disease of adrenocortical adenocarcinoma, which can result in alopecia, splenomegaly, and enlarged genitalia in affected mustelids. The basic steps of surgical removal of the affected adrenal gland are also shown. The illustration aids students learning exotic animal medicine, and can help clients with affected pets better understand the disease.