Originally from Central and South America where ancient Incans used them as pack animals and harvested their soft wool, llamas are actually related to dromedary camels from Arabia. Today llamas are kept primarily as pets, guard animals, and pack animals used for trekking expeditions in mountainous areas. Llamas are really similar to another relative of the camel from North America—the alpaca—except llamas are bigger and have longer heads. Male llamas can be territorial and will protect their herd from predators. Some breeders use this instinct to train llamas to guard sheep, goats, or other livestock. If a llama is overly agitated, it spits. This is a defense mechanism and means the llama is scared or feels threatened. Llamas live as long as twenty-five years and females give birth to one baby, called a cria, at a time.