By definition, zoology is the branch of biology dealing with animals and the animal kingdom. Since it is such a large branch of biology, there are many branches of zoology. Below is a list of the most common branches of zoology.
General Branches
| Anatomy | The study of the internal structure of animals |
| Cytology | The study of cell structure, its organelles, and their functions |
| Ecology | The relationship between the organisms and their surrounding environments |
| Embryology | The study of the development of eggs after fertilization |
| Evolution | The study of the origin of animals and their adaptation to their environments over time |
| Genetics | The study of heredity and its variations |
| Geology | The study of the earth and life as recorded by fossils in rocks |
| Histology | The study of the structure and functions of tissues |
| Morphology | The study of the form and structure of animals |
| Neonatology | The study of new born animals to the age of two months |
| Paleontology | The study of fossils and extinct animals |
| Physiology | The study of the functions and various organs in animals |
| Taxonomy | The study of the classification and the naming of organisms |
| Zoogeography | The study of the distribution of animals all over the world |
Applied Branches
| Apiculture | The rearing of honey bees |
| Aquaculture | The breeding of aquatic animals |
| Dairy Science | The study of breeding and rearing of milk yielding cattle |
| Genetic Engineering | The study of artificial synthesis of new genes and subsequent alteration of the genome of an organism |
| Pisciculture | The culturing and rearing of fish |
| Poultry | The breeding and rearing of chicks |
| Sericulture | Raising silk worms for production of raw silk |
| Veterinary Science | The study of breeding, rearing, and treatment of diseases in animals |
Phylum Specific Branches
| Acarology | The study of tics and mites |
| Anthropology | The study of apes (and man) |
| Carcinology | The study of crustaceans |
| Conchology | The study of mulluscan shells |
| Entomology | The study of insects |
| Helminthology | The study of parasitic worms |
| Herpetology | The study of reptiles |
| Ichthyology | The study of fish |
| Lepidopterology | The study of butter flies and moths |
| Malacology | The study of mollusks |
| Mammalogy | The study of mammals |
| Myrmecology | The study of ants |
| Nematology | The study of nematodes |
| Ophiology | The study of snakes |
| Ornithology | The study of birds |
| Protozoology | The study of unicellular organisms |
Organ Related Branches
| Angiology | The study of blood vessels |
| Arthrology | The study of joints |
| Cardiology | The study of the heart |
| Chondrology | The study of cartilage |
| Craniology | The study of skulls |
| Dermatology | The study of skin |
| Endocrinology | The study of endocrine glands |
| Haematology | The study of blood |
| Hepatology | The study of the liver |
| Kinesiology | The study of the movement of muscles |
| Myology | The study of muscles |
| Nephrology | The study of kidneys |
| Neurology | The study of the nervous system |
| Odontology | The study of teeth and gums |
| Ophthalmology | The study of eyes |
| Organology | The study of organs |
| Osteology | The study of bones |
| Otology | The study of ears |
| Rhinology | The study of noses |
| Splanchnology | The study of visceral organs |
| Syndesmology | The study of bony joints and ligaments |
| Trichology | The study of hair |
| Urology | The study of excretory organs |
Health and Disease Related Branches
| Actinobiology | The study of the effects of radiation on organisms |
| Bacteriology | The study of bacteria |
| Carcinology | The study of malignant tumors and cancer |
| Cryobiology | The study of the effects of low temperatures on organisms |
| Ethology | The study of animal behavior |
| Etiology | The study of the cause of disease |
| Gerontology | The scientific study of aging |
| Immunology | The study of immunity to disease |
| Oncology | The study of tumors |
| Oology | The study of eggs |
| Pathology | The study of disease |
| Pharmacology | The study of synthesis and effects of medicine on organisms |
| Phenology | The study of the effect of seasonal changes on animals |
| Phrenology | The study of the mental faculties of the brain |
| Teratology | The study of abnormal growth of embryo or fetal malformations |
| Toxicology | The study of poisons and narcotics in animals |
| Traumatology | The study of wounds |
| Virology | The study of viruses |