Llamas are a lot bigger than alpacas. They are protecters and are commonly used to protect sheep and even alpacas. They also might spit at you. Alpacas will spit at each other but not at humans (unless you get in between them in a spitting match😅). Alpacas are smaller in size ranging from 3-4 feet. Llamas can reach up to 6 feet in height. Alpacas are smaller and more timid than llamas. Alpacas are herd animals which means they like to be around other alpacas (that is why you start with 3).