Animal behaviour is the scientific study of all the actions performed by animals regardless of size or species. This includes mammals, birds, amphibians, fish, reptiles, and even humans. The study aims to investigate the relationship of animals with their physical environment as well as with other animals, whether of their genus or not. It looks into how animals look for and safeguard their resources. At the same time, it analyses how each species avoids would be predators, selects a mate for reproduction, and eventually how they care for their offspring. There are four broad fields in which scientists involved in this particular study work in, namely, socio-biology, behavioural ecology, comparative psychology, and ethology. The goals, interests, and techniques involved in each discipline overlap each other to a certain extent.