We were hiking along the Salt River in Arizona when we heard loud crashing in the underbrush on the opposite bank. A band of wild horses appeared suddenly and only stopped briefly to drink before entering the chilly water. As they splashed through the shallow river bed, the stallion paced back and forth behind them, herding them first from the left and then the right, while keeping an ever watchful eye both up and down stream. As we prepared to scatter out of their path, in one movement the small band made a sharp left turn, almost as one, and splashed upstream against the current. Another sudden turn and they were on the riverbank, only to disappear, once again, into the trees.