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Devil-birds were robot birds used by the natives of Corbo to fight their enemies. Ulla, the leader of Corbo, sent the devil-birds to defeat and kill an army of green-skinned aliens led by Lohk; they also captured members of an Earth-Mars expedition which had arrived on the planet, leaving behind only Jack and Dot Strong. Another of them attacked the First Doctor, but he narrowly got away. The devil-birds were used again when the green-skinned aliens launched another attack, allowing the Doctor and the spaceship crew to escape. (PROSE: The Devil-Birds of Corbo)