NATURE’s The Reptiles: Snakes reveals the secrets, surprises, and strangeness of two-headed snakes and other amazing reptiles. The Reptiles continues with a look at the reptiles that humans may fear most: Snakes. But the film does not portray snakes as evil creatures. Rather, it takes us into their secret and very strange world to try to understand them better. Even though most snakes are not lethal to humans, many people are still terrified of these slithering reptiles. The program illustrates how venomous snakes bite humans only in self-defense and would much rather not confront us. Snakes also provide a valuable service by controlling the rodent population.