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Birdmen (バードマン) are a race of avian heteromorphic beings.
As the name suggests this creature is a bird-human hybrid. Little is known about the appearance but from two prime examples mentioned in the novel such as Eclair (who is a penguin) and description of Peroroncino (an unknown flight capable birdman), birdmen might come in a variety of plumage.
- Some among the Birdmen like Peroroncino possessed a bestial head, wings, and limbs with avian characteristics, but Eclair appears to be an exception as it looks to resemble a penguin.