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