Answer: Inca art often depicted llamas because llamas were such big parts of the Incas lives. Their whole civilization was largely dependent on llamas.
Explanation:
Llamas were the most important domestic animal in the Inca civilization. They used the llama's wool for warmth, they used the llama dung for fertilizer in their crops, they used llamas as a source of food, the llamas carried packs during long trips and they were even used in sacrifice rituals!
I actually have a llama. He protects our goats from mountain lions, so the Incas might have used llamas to protect their sheep or whatever too. :)
I hope this helps.
