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The skull and horns of a bighorn sheep ram are marvels of evolution, perfectly suited for a life in rugged, mountainous terrain where intense head-to-head clashes can be a part of daily life. The Horns. The most striking feature of a bighorn ram’s anatomy is, of course, the massive curved horns. Unlike antlers, which are shed each year, these horns grow throughout the ram’s life, adding a new layer every winter. In some rams, they can reach a length of over 3 feet and weigh up to 30 pounds! Thes