The population of ancient reptiles of various habitats was facilitated by various idioadaptations that arose as private adaptations to environmental conditions. Among the ancient reptiles that lived in a land-air environment, the most significant are the idioadaptations associated with an active lifestyle – well-developed free limbs, many especially hind limbs (tyrannosaurus) that allow them to quickly move in space. For herbivorous reptiles, adaptations associated with passive protection from enemies were especially important – gigantic sizes (diplodocus, brontosaurus, brachiosaurus, etc.), all kinds of bone shells, shields and spikes (turtles, stegosaurus, etc.). The sea lizards were very diverse. The most famous among them are ichthyosaurs, similar in structure to sharks and dolphins, and plesiosaurs – animals with a wide body, long fins and a snake-like neck. Such structural features helped them live and hunt in the aquatic environment. Among the ancient reptiles were flying lizards. There were both sparrow-sized crumbs and giants with a wingspan of up to 15 m. The transformation of free limbs into wings allowed these animals to master the air habitat.
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