Zoology is a single specialty within the field of biology, but it is a vast specialty that includes many major subspecialties. Some zoologists study a single animal or a category of animals, whereas others may specialize in a particular part of an animal's anatomy or study a process that takes place in many kinds of animals. A zoologist might study single-cell organisms, a particular variety of fish, or the behavior of groups of animals such as elephants or bees.

Many zoologists are classified according to the animals they study. For example, entomologists are experts on insects, ichthyologists study fish, herpetologists specialize in the study of reptiles and amphibians, mammalogists focus on mammals, and ornithologists study birds. Embryologists, however, are classified according to the process that they study. They examine the ways in which animal embryos form and develop from conception to birth.

Within each primary area of specialization there is a wide range of subspecialties. An ichthyologist, for example, might focus on the physiology, or physical structure and functioning, of a particular fish; on a biochemical phenomenon such as bioluminescence in deep-sea species; on the discovery and classification of fish; on variations within a single species in different parts of the world; or on the ways in which one type of fish interacts with other species in a specific environment. Others may specialize in the effects of pollution on fish or in finding ways to grow fish effectively in controlled environments in order to increase the supply of healthy food available for human consumption.

Some zoologists are primarily teachers, while others spend most of their time as researchers, performing original research. Teaching jobs in universities and other facilities are probably the most secure positions available, but zoologists who wish to do extensive research may find such positions restrictive. Even zoologists whose primary function is research, however, often need to do some teaching in the course of their work, and almost everyone in the field has to deal with the public at one time or another.

Students often believe that zoological scientists spend most of their time in the field, observing animals and collecting specimens. In fact, most researchers spend no more than two to eight weeks in the field each year. Zoologists spend much of their time at a computer or on the telephone.

It is often the case that junior scientists spend more time in the field than do senior scientists, who study specimens and data collected in the field by their younger colleagues. Senior scientists spend much of their time coordinating research, directing younger scientists and technicians, and writing grant proposals or soliciting funds in other ways.

Raising money is an extremely important activity for zoologists who are not employed by government agencies or major universities. The process of obtaining money for research can be time consuming and difficult. Good development skills can also give scientists a flexibility that government-funded scientists may lack. Government money is sometimes available only for research in narrowly defined areas that may not be those that a scientist wishes to study. A zoologist who wants to study a particular area may seek his or her own funding in order not to be limited by government restrictions.

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