Botflies, also known as warble flies, are small parasitic insects that infest livestock, wild animals, and humans. They are known for their painful bites and the damage they cause to the host's skin and tissues. Some synonyms for botflies include gadflies, heel flies, and bots. Gadflies are large flies that mainly affect horses and cause painful bites and skin lesions. Heel flies are similar to botflies and infest cattle, causing discomfort and decreased milk production. Bots are the immature stages of botflies that live in the intestines and stomach of horses and other animals, causing irritation and inflammation. Regardless of the name, botflies and its synonyms are definitely unwanted guests for most animals.