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In page Przewalski's horse:

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Przewalski reported the horses forming troops of between five and fifteen members, consisting of a mature stallion, his mares and foals.[1] Modern reintroduced populations similarly form family groups of one adult stallion, one to three mares, and their common offspring that stay in the family group until they are no longer dependent, usually at two or three years old. Young females join other harems, while bachelor stallions as well as old stallions who have lost their harems join bachelor groups.[2] Family groups can join to form a herd that moves together.[citation needed]