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Pecking order is a system of organization discovered by Thorleif Schjelderup-Ebbe in the early twentieth century. In this system, a bird pecks another bird who is of lower rank, and submits to pecking from a bird of higher rank. It is a basic concept in social hierarchy that has its counterpart in other animal species as well, including humans. Among mammals and other animals, the term "dominance hierarchy" is used. Still, the term "pecking order" is often used synonymously as well, because the "pecking order" was the first studied example of the social hierarchy among animals. Order of the Beak. User-contributed text is available under the Creative Commons By-SA License; additional terms may apply.