The Manman (蛮蛮) or Biyiniao (比翼鳥) is a duck-like creature in Chinese Mythology. It is one of the mythical beasts featured in the Chinese classic text Classic of Mountains and Seas (山海经).
According to the Classic of Mountains and Seas, the Manman lives in Chongwu mountain. The Manman resembles a duck with one eye and wing. It is able to fly when two Manman join together. One bird is blue while the other is red. The birds are often interpreted to be a male and female and are often used to symbolise love (with Biyiniao meaning "lovebirds"). Floods are said to happen with the Manmans appearance.