This article is from the Llamas & Alpacas FAQ, by Michael Shealy and William Bagwell with numerous contributions by others.
Size and fiber quality. Llamas were primarily bred to be a beast of burden, and alpacas were bred primarily as fiber producers. An average alpaca standing 34"-36" at the withers, where llamas stand 42"-48" at the withers. An adult alpaca will generally produce 5-8#s of high quality exotic uniformly crimped fiber in a single fiber fleece, each year.
 
Continue to: