ONTOGENY AND FUNCTION OF RANK ORDER IN A SIBLING GROUP OF GREYLAG GEESE (ANSER-ANSER L)

Abstract

A rank order was established between the siblings of a family of greylag geese (A. anser L.) by fighting during the 1st days after hatching, and also by other, more complex interactions. The position of each goose in the rank order can be defined by 3 groups of behavior patterns (aggressive behavior, greetings, escape responses). A clear-cut ranking relation between 2 individuals is a prerequisite for their close cohesion. The survival function of rank order lies in diminishing the intensity and frequency of agonistic interactions, in diminishing social stress situations and in guaranteeing the close family cohesion.