Ibero-mesornis
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| Noun | 1. | Ibero-mesornis - sparrow-sized fossil bird of the Cretaceous period having a vestigial tail; found in Spain; considered possibly the third most primitive of all birds bird - warm-blooded egg-laying vertebrates characterized by feathers and forelimbs modified as wings genus Ibero-mesornis - a genus of fossil bird of the subclass Archaeornithes |
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