"The Emperor’s New Groove" theory is that some animals in the movie can talk, like Kuzco. There was a scene that llama Kuzco was walking in a scary forest and an insect was eaten by a spider. The insect TALKED, wich means that probably that insect once was a human. Mayba also poisened by Yzma? In this GIF you see what fans think Yzma would do if Kuzco was an insect NOT a llama.