Mustangs | Spirit of the Shrinking West, National Geographic magazine: Mustang Herd Crosses Flooded Stream

A band of wild horses crosses a stream after a heavy rain in South Dakota. Survival dictates that the herd members ultimately cooperate and stick together. As with many animals that live in large groups, establishment of a stable hierarchy or “pecking order” is important to smooth group functioning. A lead mare often determines when the herd moves and others follow.

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