Thorleif Schjelderup Ebbe: The Pioneer of Pecking Orders

A Life Dedicated to Unraveling the Secrets of Animal Behavior

Thorleif Schjelderup Ebbe, a Norwegian zoologist and comparative psychologist, is renowned for his groundbreaking discovery of the pecking order of hens. At the tender age of 19, in 1913, Ebbe's observations of chickens on a farm during his summer holidays led him to uncover the intricate social hierarchy that governs the behavior of birds. This discovery, which challenged conventional wisdom, paved the way for a deeper understanding of animal behavior and social structures.

Early Life and Education

Born on November 12, 1894, in Kristiania (now Oslo), Norway, Ebbe was the son of sculptors Axel Emil Ebbe and Menga Schjelderup. His fascination with animals and their behavior began at a young age, and he went on to pursue higher education in Germany, where he earned his Ph.D. in zoology. Although his thesis was initially rejected by the University of Oslo, Ebbe's determination and perseverance eventually led to its acceptance.

Theories and Contributions

Ebbe's most significant contribution to the field of animal behavior is his concept of the pecking order, which describes the hierarchical structure of dominance and submission within groups of birds. His research demonstrated that this order is not solely dependent on the strength or age of the birds, but rather on a complex interplay of social interactions. This discovery has far-reaching implications for our understanding of social behavior in various species, including humans. Ebbe's work extended beyond the realm of birds, as he also studied the behavior of other animals, including monkeys and dogs. His comparative approach to psychology aimed to uncover the universal principles governing animal behavior, and his findings have had a lasting impact on the field of zoology and psychology.

Major Works

Ebbe's written works showcase his dedication to the study of animal behavior and psychology. Some of his notable publications include:

• Hnsenes stemme. Bidrag til hnsenes psykologi (1913), which introduced the concept of the pecking order to the scientific community.
• Beitrge zur Biologie und Sozialpsychologie bei Gallus domesticus (1921), a comprehensive study on the biology and social psychology of domestic chickens.
• Soziale Verhltnisse bei Vgeln (1922), which explored the social relationships among birds.

Personal Life and Legacy

Ebbe married Torbjørg Brekke, and their son, Dag Schjelderup Ebbe, grew up to become a musicologist, composer, and music critic. Throughout his life, Ebbe remained committed to his work, leaving behind a rich legacy of contributions to the field of animal behavior and psychology. Thorleif Schjelderup Ebbe's pioneering work continues to inspire researchers and scientists today, offering valuable insights into the intricate social structures of animals and their behavior. His discovery of the pecking order has become an integral part of our understanding of animal behavior, and his contributions to the field of zoology and psychology remain unparalleled.