I live in New Zealand and have never, ever heard of people using alpacas to guard sheep. We don't HAVE any large carnivores for them to be protected against! Heck before the first people arrived the only mammal on these islands was a tiny bat.

Interesting instincts the alpacas have there though, to guard other animals.

Yeah we've got purple potatoes and kumara (sweet pototo) in New Zealand, still a bit of a novelty, but def not from outter space.

http://subs.nzherald.co.nz/location/story.cfm?l_id=139&ObjectID=10376555