Hornworms are the larval stage of certain moths, primarily from the family Sphingidae. They are known for their large size, often reaching up to 4 inches long, and their distinctive green color, which helps them blend in with plants. Hornworms are commonly found on tomato and pepper plants, where they feed on the leaves, causing significant damage to crops. These caterpillars have a characteristic horn-like structure on their rear end, which gives them their name. While they are a natural part of the ecosystem, they can be considered pests in gardens and farms. Farmers often use various methods to control their populations, including natural predators and organic pesticides.