Mosasaurus
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Ichthyornis
Hesperornis
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Hesperornithes
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Elasmosaurus
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Enantiornithes
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Confuciusornis
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Western Interior Seaway
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Othniel Charles Marsh
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Pteranodon
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Carinatae
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Cretaceous
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Bird
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Archaeopteryx
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Ichthyornis dispar
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Icthyornis dispar
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