Definitions from Wiktionary (pecking order)

▸ noun:  (zoology) The natural hierarchy of social status and dominance occurring in a group of birds.
▸ noun:  The usually informal hierarchy of authority or command, often partial or approximate, as determined by the especially natural propensity for domination of different members of a specific group over each other, such as older brothers and sisters over their younger siblings.
▸ Also see pecking_order


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