Zoology is the branch of biology that studies animals. Zoologists may study animal classification and evolution, habits and habitats, population and distribution, anatomy, and other aspects of the lives of animals, both living and dead, extant or extinct. Specialties in this field include ornithology (the study of birds); herpetology (the study of reptiles and amphibians); entomology (the study of insects) and ichthyology (the study of fish). Related fields include evolutionary biology and paleontology. The t-shirts here are made for anyone who works as a zoologist or for those interested in pursuing the field as a professional or as an avocation.