Rattle snake rattle
Native to North and South America, rattlesnakes are large venomous snakes, that are experts at hissing as well as their bone-chilling rattle. The rattle itself is hollow and is made of keratin (just like human's fingernails) that is located at the end of the serpent's tail. When the rattlesnake erects its tail and vibrates its muscles, these segments collide with each other, thus producing the rattling sound.