Botflies are parasitic insects that lay their eggs in the skin of mammals, where the larvae then develop and feed off the host. The term "botfly" comes from the Old English word "bote," meaning "remedy" or "relief," because botflies were once believed to have medicinal properties. In other regions of the world, botflies are known by different names, such as "warble flies," "heel flies," "grub flies," and "gadflies." These synonyms all refer to the same type of insect and its parasitic larvae, but may vary in their specific geographic or cultural context. Regardless of the name, botflies can be a nuisance for both humans and their animal companions.