I looked it up. There are both in these pictures. Llamas are twice as large and full bodied, course outer hair over a very fine under coat. Alpacas are the smaller and slimmer of the two and have fine silky hair. Both are herd animals and like to be with others. Both are gentle and can be tamed easily with the right handling.
http://www.mountairyalpacas.com/llama.html
peace