Approximately two hundred Peninsular bighorn sheep (Ovis canadensis) live in the Lake Mead territory that covers the Lake Mead National Recreation Area and part of Arizona. The Lake Mead Area staff cautions visitors to remember the sheep are not tame, and they (the sheep, that is) butt heads at 50 mph with 2400 pounds of force and can and have butted people who get too close. These sheep, slightly smaller than the Rocky Mountain bighorn sheep, are endangered, Why are these sheep endangered? The answer is simple, they are endangered because of disease, predation, habitat loss, and because of...