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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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