How did ethology become a scientific field during the 20th century?

Ethology emerged as a distinct scientific discipline in the 20th century, primarily through the work of European biologists who shifted the focus of animal behaviour studies back to natural environments.12

The Shift to Field Science

In the early 20th century, the study of animal behaviour was dominated by psychologists who utilized laboratory settings to test hypotheses on a limited number of species. In contrast, the founders of modern ethology—most notably Konrad Lorenz, Nikolaas Tinbergen, and Karl von Frisch—advocated for an inductive approach. They emphasized direct, naturalistic observation of a broad array of species in their native habitats to understand how specific behaviours contribute to survival and reproduction.23

Key Contributions

• Levels of Analysis: Tinbergen established a comprehensive framework for studying behaviour, requiring researchers to address four distinct questions: causation, ontogeny, function, and evolutionary history.2
• Fixed-Action Patterns: Ethologists identified genetically programmed, species-specific behaviours known as fixed-action patterns, which are triggered by specific environmental stimuli.3
• Recognition: The foundational work of Lorenz, Tinbergen, and von Frisch was formally recognized when they were jointly awarded the Nobel Prize for Physiology or Medicine in 1973.45