Anthrozoology is a study of the interaction between humans and other animals. This sub-discipline of zoology overlaps with anthropology, veterinary medicine, ethnology, and zoology.

Arachnology is a branch of zoology that deals with the study of spiders and related species known as arachnids (such as scorpions, harvestmen, etc.).

Archaeozoology is the study of dead animals (faunal remains) that includes their bones, shells and other body parts. It is also known as zooarchaeology.

Bionics is the study of mechanical systems that function like living organisms or parts of living organisms. It applies biological methods and systems found in nature to the study/design of engineering systems and modern technology.

Cetology is a branch of zoology that deals with the study of marine mammals that include whales, dolphins, porpoise, etc.

The branch of zoology that studies the prenatal development of gametes (also known as sex cells), fertilization, and development of embryos and fetuses.

Entomology is the study of insects. The following is the list of Entomology sub-branches that specialize in different types of insects.

Ethology is a branch of zoology that deals with animal behavior under their natural habitats and studying their behavior as an adaptive trait in evolution.

Helminthology is the study of parasitic worms (helminths) and deals with the taxonomy of helminth and the effect on their hosts.

Herpetology is the study of reptiles and amphibians.

Histology is the study of the microscopic anatomy of cells and tissues of animals and plants.

Ichthyology is a branch of zoology that covers the study of fish (also known as fish science).

Malacology is the study of Mollusca such as snails, slugs, octopus, clams, and all animals that live in water with shells.

Mammalogy is the study of mammals and their characteristics. Mammalogy is also referred as Mastology, Theriology or Therology.

Morphology is a branch of zoology dealing with the study of the form and structure of organisms and their specific structural features.

Nematology is a sub-discipline of zoology that studies roundworms (nematodes).

Ornithology is a branch of zoology that deals with the study of birds. Check out the most colorful birds in the world.

Palaeozoology is a branch of zoology that deals with the study of fossil animals to identify multi-cellular animals from geological perspective to establish prehistoric environments and their ecosystems.

Pathology is the study of bodily fluids in the laboratory such as blood, urine or tissues to diagnose a disease. It further narrows to plant pathology (for plants) and veterinary pathology (for animals).

Primatology is a study of living and extinct primates (monkeys, apes, and prosimians).

Protozoology is a branch of zoology that deals with the study of Protozoa (which are unicellular organisms such as amoeba, etc.).

Taxonomy is a study that defines groups of biological organisms based on shared characteristics and giving names to those groups. Check out the levels of biological organization in detail.

Zoogeography is the scientific study of the geographical distribution of animal species (both historical and contemporary) in the world.

Zoography is the study of animals and their habitats (also known as descriptive zoology).

Zoometry is a sub-division of zoology that deals with measurements (length or size) of animal parts.

Human Anatomy is the study of the structure of humans and their various parts whereas Zootomy specifically refers to animal anatomy.