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Although not as good at climbing as mountain goats, bighorn sheep zigzag up and down cliff faces with amazing ease. They can perch on ledges only 2 inches wide, and bounce from ledge to ledge over spans as wide as 20 feet. They can move over level ground at 30 miles per hour and scramble up mountain slopes at 15 mph. They also swim freely, despite their massive bulk and the weight of their horns.