Guard llama
A guard llama is a llama, guanaco, alpaca or hybrid that is used in farming to protect sheep, goats, hens or other livestock from coyotes, dogs, foxes and other predators. In the past, a single gelded (castrated) male was recommended. In more recent years it has been discovered that single, unbred females make better and safer guardians. They also do not pose the risk of attempting copulation (hence smothering) or chasing the smaller livestock.
Guarding
Guard llamas may defend against predators in many ways. Llamas are instinctively alert and aware of their surroundings, and may draw attention to an intruder by making a startling alarm call that sounds like a rusty hinge. They may walk or run toward an intruder, and chase or kick it. Some llamas may herd the animals they are guarding into a tight group or lead them away from danger and to the spot where they may feel the safest. Others may stand apart from the group and watch the intruder. Although llamas have been known to kill predators (such as coyotes), they should not be considered attack animals. They are generally effective against single intruders only, not packs. In the US, guard llamas have been most common in ranches located in western regions, where larger predators, such as the coyote, have been more prevalent. Not every llama will guard, however, and it should not be assumed that because it is a llama it will guard.