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Like today birds, the Archaeopteryx had feathers, and teeth too. They lived in the jurassic period, 150 millions of years ago. They were like about 1 feet with 8 inches.
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The first bird in the world.
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It is a clade of birds that includes Confuciusornis and all it`s derived birds. Chiappe(1997) defined Pygostylia as the "common ancestor" of Confuciusornithidae. They lived in the Lower Cretaceous-Holocene.
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It is a clade of birds that includes the Enantiornites and some Neornithes.
Ornithothoraces mens birds chest and that refers to the chest derived of the modern birds. They lived in the Lower Cretaceous-Holocene. -
All the Neornithes birds that lives since the cretaceous to the present
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It is a clade that includes modern birds and some others similars. They lived in the in the Lower Cretaceous to the present
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It is a clade that includes all modern birds.