The distinctive sound of a rattlesnake's tail lets other animals know that a deadly viper lies nearby. Readers will learn how these poisonous predators use venom to paralyze and kill their prey. They will also find out how a rattler's tail produces its signature sound and what to do if they ever spot a rattlesnake resting nearby.The distinctive sound of a rattlesnake's tail lets other animals know that a deadly viper lies nearby. Readers will learn how these poisonous predators use venom to paralyze and kill their prey. They will also find out how a rattler's tail produces its signature sound and what to do if they ever spot a rattlesnake resting nearby.