If you think you're the ultimate metalhead, you haven't met these hardcore animals. They're so edgy they make us want to headbang.
Though some animals are just born with naturally rocking colours and features, others have unique traits that make them even metal-er (which is officially a word). Goats have long been associated with Satanism due to their disobedient and stubborn nature. Texas horned lizards, also known as "horny toads," have the bizarre ability to shoot streams of blood from the corners of their eyes in order to deter predators. Does it really get more metal than that?
Check out our list of hard rocking animals below, and add your own if you've got a pet that leans toward the dark side.