Jealousy is an ugly beast affecting men, women, and communities at large. In the novel, jealousy ranges from simple envy to an obsessive desire to hurt or take revenge on the object of desire. This spite can manifest itself in bitter words aimed to injure, unfounded rumors, plain falsehoods, confinement, or physical violence. Often, jealousy is unvoiced but its presence can be fathomed by the bestial terms in which the narrator immerses the jealous character. The idea is that jealousy strips one of his reason and humanity, rendering him animalistic and base. Jealousy can lead to blind hate if allowed to fester long enough.
In their most jealous or base moments, characters are often depicted as animals to emphasize that jealousy is inhumane.