I've been reading up on llamas, and I've found that they could guard a herd of goats. But I'm unsure of the number of llamas. Some sites say llamas are very social and you need two to keep each other company. Others say if you only have one llama, they'll stay closer to the herd they're guarding, and won't go off to form a separate group. I'd like the llama(s) to guard a possible herd of goats, but I don't need them to, and I don't want a lonely llama to become depressed. What's best?