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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 Dinosauria.jpgExtinct bird relatives Champsosaurus.JPG†Champsosaurus Coelurosauravus 1.jpg†Coelurosauravus
Crocodilians.jpg Crocodilians "True" crocodiles.jpgExtinct croc relatives Euparkeria.jpg†Euparkeria Hyperodapedon
Ichthyosaurs.jpg†Ichthyopterygians Snakes.jpgLizards & Snakes Pareiasaurs.jpg Pareiasaurs Phytosauria.jpg†Phytosaurs
Plesiosaurs.jpg†Sauropterygians Proterosuchus.JPGProterosuchus Protochirotherium.JPG†Protochirotherium Protorosauria.JPG†Protorosaurs
Shringasaurus.jpgShringasaurus YowieTasmaniosaurusHead.jpgTasmaniosaurus Rhynchocephalia.jpgTuataras Marsh turtles.jpg Turtles
JoyCityOdontochelysThumb.jpg Extinct turtle relatives