Bighorn sheep

Bighorn sheep can weigh a maximum of around 300lbs at adulthood. Their horns, however, can weigh up to 30 lbs, although the male's or ram's horns are typically larger than the female's or ewe's. Because these sheep reside in the mountains alongside mountain goats or bears, bighorn sheep have great eyesight, paired with rough bottomed, split hooves, allow them to traverse about the Rocky Mountains with ease.
Despite these features, the big horn sheep can still be put in jeopardy, specifically by worm eggs. As the sheep feast on grass, they may provide a new habitat for worm eggs to hatch larvae. These larvae then mature and burrow into capillaries that transfer the worm to the lungs. The worms then proceed to form cysts, which can affect the sheep's breathing.
These horned sheep multiply through sexual reproduction between an ewe and a ram.