According to the First Doctor, the Visians were about eight feet tall, "vicious", and the only sentient species indigenous to Mira. The pattern of their footprints seemed to indicate that they were bipeds. When exterminated by Daleks they were briefly visible and seemed to have a roughly humanoid form.(TV: The Daleks' Master Plan) One account claimed the Visians were capable of speech. Additionally, when made visible (such as when covered in mud), they appeared "thin, bony, with two long, clawed arms, feet like birds' claws, and a narrow head with a beak." (PROSE: Mission to the Unknown)