In this issue of Veterinary Clinics: Exotic Animal Practice, guest editors Drs. Sarah Ozawa and João Brandão bring their considerable expertise to the topic of Endocrinology of Zoological Companion Animals. Top experts in the field offer a wide range of clinically relevant articles covering several species, including topics such as ferret insulinomas and adrenal disease; ovarian cystic disease guinea pigs; thyroid disease in rabbits and rodents; hypothalamic pituitary physiology in birds and reptiles; glucose homeostasis and derangement in birds; and many more. Contains 11 relevant, practice-oriented topics including endocrine diagnostics: principles and applications; adrenal disease in small mammals; reproductive control and management in birds; unique calcium metabolism in zoological companion animal species; fish endocrinology; and more. Provides in-depth clinical reviews on endocrinology of zoological companion animals, offering actionable insights for clinical practice. Presents the latest information on this timely, focused topic under the leadership of experienced editors in the field. Authors synthesize and distill the latest research and practice guidelines to create clinically significant, topic-based reviews.