Thysania agrippina is a large moth in the Noctuidae family. It has numerous common names, including White Witch, Birdwing Moth, Ghost Moth, Great Grey Witch, and Great Owlet Moth. It has a wingspan of up to 12 inches (31 cm), making it the Lepidopteran with the biggest wingspan. (The Atlas moth, however, has a greater wing area.) The species occurs in Mexico, Central and South America, but it appears as a stray as far north as Texas.