The branch of Biology that studies animals, including their structure, function, growth, origin, evolution, and distribution.

the scientific study of animal life. Zoological sciences include the studies of evolution, systematics, cell biology, biochemistry, micro and macro anatomy, development, genetics, physiology, ecology, biogeography, biodiversity, behavior and sociobiology

Zoology (rarely spelled zoölogy) is the biological discipline which involves the study of non-human animals.