Why Do Some Mountain Lions Have Shortened Ears? In the rugged landscapes of the northern Rockies and high plains, many mountain lions develop a distinct look—ears that appear rounded or shortened. This isn’t a genetic trait but a battle scar from enduring brutal winters. Frostbite is the culprit. Exposed to extreme cold, relentless winds, and moisture, the delicate tissue at the tips of their ears can freeze, die off, and eventually fall away. Over time, this gives many lions in colder regions t