
Archosaurs Meaning ruling lizards, was a family of Theocodonts; Crocodilians; Saurischian dinosaurs; Birds; Ornithischian dinosaurs; and Pterosaurs. Most groups lived in the Mesozoic Eras Triassic, Jurassic, and Cretaceous periods.
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http://www.wordinfo.info/words/index/info/view_unit/2780/

All reptiles in the Archosauromorpha, the large group of diapsid reptiles that includes all thecodonts and their descendants (including birds and crocodiles), but does not include lizards, snakes, or turtles. All archosaurs have an opening on each side of the skull, in front of the eye socket, called the antorbital fenestra.
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https://academy.allaboutbirds.org/bird-academys-a-to-z-glossary-of-bird-ter
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