Operant conditioning. Concentrated on behavior, few species, controlled environments, neglected evolutionary perspective. See: Thorndike, Watson, Skinner.
Entangled with political movements. Eugenics, Social Darwinism, Sir Frances Golton. Nazi Ideology of genetic purity. Study of life and living organisms. Originated with Lamarck, but Darwin created what we needed.
Reject any biological basis for human behaviors. Asserted culture as major determinant in human behavior. Franz Boas: Margaret Mead.
Human behavior ecology. Evolutionary Psychology. Animal’s behavior act to maximize reproductive success. Wilson, Williams, Hamilton, Trivers.