Fission–fusion society

In ethology, a fission–fusion society is a social organization in which the size and composition of the group change as time passes and animals move throughout the environment. Such animals merge into a group (fusion)—e.g., sleeping in one place—or split (fission)—e.g., foraging in small groups during the day. Such societies are described in terms of the change in composition, subgroup size, and dispersion of different groups.

This social organization is found in several primates, elephants, cetaceans, ungulates, social carnivores, some birds and some fish.

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