I don't remember the exact wording, but I've heard and read that alpacas are fairly nice, while llamas will wait to knife you when your back is turned. I have

I don't remember the exact wording, but I've heard and read that alpacas are fairly nice, while llamas will wait to knife you when your back is turned. I have a friend down under (to the right of Oz) who has the former and has some knowledge of the latter. I seem to recall her confirming this, when I mentioned it.