Llama or alpaca?

schnoodlepooh asked whether my llama in a recent Forward the Canon photograph was an alpaca. Good question. In that state where ignorance is bliss, I had always thought they were the same genus but knew no more than that. However, our old friend Google came up with the goods Problem is, I did not make a sufficiently detailed examination of my model to decide. On balance of probability related to what I have read, I think it is most likely a llama. The image with this post is said to be an alpaca and seems to reinforce my deduction.