Alpacas of America provides a nice description of these wonderful fiber animals.
Alpaca is heavier than wool and does not have the elasticity. It is also slipperier than wool. I am spinning it with a bit more twist than wool and am plying it loosely to keep it soft and encourage drape. I plan to knit a shawl with this black alpaca and use my handspun English Angora for an accent design.