Study of animal behaviour.
It is a combination of laboratory and field science, with strong ties to other disciplines (e.g., neuroanatomy, ecology , evolution ). Though many naturalists have studied aspects of animal behaviour through the centuries, the modern science of ethology is considered to have arisen as a discrete discipline with the work in the 1920s of Nikolaas Tinbergen and Konrad Lorenz . Interested in the behavioral process rather than in a particular animal group, ethologists often study one type of behaviour (e.g., aggression) in various unrelated animals.