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How to sign: warm-blooded egg-laying vertebrates characterized by feathers and forelimbs modified as wings
Categories: craniate, vertebrate
Within this category: apodiform bird, aquatic bird, archaeopteryx, archaeornis, bird of passage, bird of prey, caprimulgiform bird, carinate, cock, coraciiform bird, cuculiform bird, dickeybird, gallinaceous bird, hen, Ibero-mesornis, nester, night bird, nonpasserine bird, parrot, passerine, piciform bird, protoavis, ratite, Sinornis, trogon, twitterer