What were reptiles like during the Mesozoic era?

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During the Mesozoic era, reptiles were exceedingly diverse and numerous. The reptilian dinosaurs included the largest terrestrial animals that have ever lived, as well as many smaller forms. There were also flying and aquatic reptiles. With the rise of the early mammals the decline of the reptiles began. The only large and successful modern group of reptiles is the order of lizards and snakes . Snakes are descended from lizards, but have lost their limbs. Reptiles, like fish and amphibians, are cold-blooded, that is, they have little ability to regulate their body temperature, which approaches that of the environment. The reptiles gave rise to the two warm-blooded vertebrate groups, the birds and the mammals ...