When a llama puts its ears back it means it is agitated. It may start to make a clucking noise as if it is bringing up stomach acid. Take caution it does not spit on you. When a llama spits it can be so hard it may bruise the skin. Spitting is a llama’s defense mechanism. Most llamas will opt to run away from a person before they spit, however some will choose to spit on you.