Comparative Psychology in broad sense refers to the study of the behavior and mental life of animals other than human beings. It is same as the animal psychology but the comparative psychology is the absolute term to mention and it is often used less. Some of the Veterinarians use the phrase "animal psychology to refer specifically to the disotder behavior of animals.
Comparative Psychology was known in the late nineteenth century by the work of George Romanes on the animals and George Romanes is inspired of Charles Darwin and have confirmed as a important discipline in the academic psychology. During the later stage Comparative Psychology is concerned of doing experiments on animals to discover some fundamental principles especially learning, social behavior of animals but social behavior has been the lesser parting the analysis. The popular study of social dominance in chickens is done by T.Schjederup-Ebbe, which give rise to the concept of the "pecking order" which is the early contribution to the field.
During 1980s Comparative Psychology has become or undergone reversal in the fundamental approach. In order to compare the seeking principles in animal behaviour and explain the human performance, it begin taking principles that are uncovered in the study of human cognition and testing them. This lead to the advancement of concept formation, memory, problem solving and other abilities in animals.