A hissing reptile is a type of animal that makes a loud, high-pitched sound when threatened or disturbed. The most common example of this type of reptile is the SNAKE, which is a five-letter word. Snakes are found in many different habitats around the world and come in a variety of sizes and colors. They are carnivorous animals that feed on small mammals, birds, and other reptiles. Snakes have long, slender bodies and can be dangerous if not handled properly.