This past weekend, we let the llama and the alpacas into one of the fenced forest areas for browsing rather than the usual grazing of grass. They were there all weekend, munching away on various vines and trees.
And behold! There was pellet-poop! And it was good! ... And by this morning, it was back to blobs. So now I know that even hay is not really doing it for the alpacas. They are missing something vital to their little digestive systems that can be satisfied by oaks, maples, creeper, and berries.