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Reptiles including birds, together with their extinct relatives, are known collectively as "sauropsids". The scientific name Sauropsida (meaning "lizard faces") is used for the group of amniotes that includes all modern reptiles and birds as well as their fossil ancestors, including the dinosaurs, the immediate ancestors of birds. Sauropsida is distinguished from Synapsida, which includes mammals and their fossil relatives.

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Aves.jpgBirds Zhuchengtyrannus.jpgExtinct bird relatives Champsosaurus.JPG†Champsosaurus Coelurosauravus 1.jpg†Coelurosauravus
Crocodilians.jpg Crocodilians "True" crocodiles.jpgExtinct croc relatives Euparkeria.jpg†Euparkeria Ichthyosaurs.jpg†Ichthyopterygians
Snakes.jpgLizards & Snakes Pareiasaurs.jpg Pareiasaurs Phytosauria.jpg†Phytosaurs Plesiosaurs.jpg†Sauropterygians
Proterosuchus.JPGProterosuchus Protochirotherium.JPG†Protochirotherium Happy Kin Scaphonyx-kelly.jpgRhynchosaurs Shringasaurus.jpgShringasaurus
Protorosauria.JPG†Tanystropheus YowieTasmaniosaurusHead.jpgTasmaniosaurus Rhynchocephalia.jpgTuataras Marsh turtles.jpg Turtles
JoyCityOdontochelysThumb.jpg Extinct turtle relatives