Known for their woolly charm, sure-footed strength, and a propensity to spit at you if you bother them too much, llamas have had a rich and diverse history. Since their domestication high in the Andes, they have been farmed, smuggled, sacrificed, and sometimes kept around just to be petted. They have functioned at different times as luxury commodities, literary muses, and national symbols, and they have served by turns as beasts of burden, circus...