Mammalian teeth have evolved into different forms because they are used for different purposes. Elephant tusks, which can be used for defense and for lifting, are actually modified incisors and are the largest teeth in the world. The lower incisors of pigs are close together and projected forward so that they can be used as a tool for digging. Baboons feature enlarged canine teeth that are utilized for defense and display. However, the sawfish may be the most unusually adapted since it is the only animal with true teeth outside its mouth. Members of the species utilize the teeth on the sides of their snouts to lacerate prey.