- Biology : The science of life — of complex, self-organizing, information-processing systems living in the past, present or future.
- Anatomy : The branch of morphology given to the study of the structure of members of the biological kingdom Animalia (animals).
- Ecology : The study of the distribution and abundance of organisms and how they are affected by the environment.
- Embryology : The study of how organisms develop between the times of conception and birth.
- Ethology : The scientific study of animal behavior.
- Palaeontology : The study of extinct life forms, particularly fossils.
- Physiology : The study of the mechanical, physical, and biochemical functions of tissues and how they interact.
- Taxonomy : The principles underlying classification, often in a hierarchy.
- Charles Darwin : (1809 – 1882) English natural scientist, most famous for proposing the theory of natural selection.
- Richard Dawkins : British ethologist, evolutionary biologist; writer and broadcaster on science and atheism (born 1941).
- Jane Goodall : A British primatologist, famous for having observed tool use in a non-human species (the chimpanzee) for the first time.
- Desmond Morris : Add brief definition or description
- John Maynard Smith : Add brief definition or description