How did ethologists and comparative psychologists differ in their early studies of animal behavior?

In the early 20th century, the study of animal behavior was shaped by two distinct approaches: comparative psychology and ethology. While both fields sought to understand how and why animals behave, they differed significantly in their methodologies, environments, and core objectives.1

Comparative Psychology

Comparative psychologists, such as John B. Watson and B.F. Skinner, primarily conducted research in controlled laboratory settings using a limited number of species, such as rodents, dogs, and pigeons. Their work was largely driven by a deductive approach, where they formulated general hypotheses about behavioral phenomena—most notably learning—and tested them through experimentation. Their focus was oriented toward psychological and physiological questions, aiming to uncover universal principles of behavior.1

Ethology

In contrast, ethologists like Konrad Lorenz and Nikolaas Tinbergen advocated for an inductive approach rooted in natural history. They emphasized the importance of observing a broad array of species within their natural habitats to understand behavior from a biological and evolutionary perspective. Ethologists sought to answer why specific behaviors evolved and how they contribute to an animal's survival and reproductive success. Their research often highlighted fixed-action patterns—genetically programmed, species-specific behaviors released by specific environmental stimuli—rather than focusing solely on learned responses.12