Reptiles and mammals are animals that breathe air through the use of lungs. They are also vertebrates, which means they have backbones, and they are both descended from labyrinthodonts, large, extinct, freshwater amphibi... More » Pets & Animals Reptiles

Alligators are predators, eating fish, birds, mammals, mollusks and other reptiles. They consume prey of increasingly larger size as they grow from juveniles to adults. Although their diet is primarily flesh-based, allig... More » Pets & Animals Reptiles

Some characteristics all reptiles have in common are that they have scales, lungs and backbones or vertebrae. Reptiles are also ectothermic. Although most reptiles lay eggs, there are some that have live birth, such as b... More » Science Biology Zoology
similar articles

Modern biologists arrange the more than 8,000 living species of reptiles into four main groups: Squamata, Crocodilia, Testunides and Sphenodons. These groups are only distantly related, with some reptiles being more clos... More » Pets & Animals Reptiles

Although most reptiles lay eggs, some reptiles retain the eggs, and the young are hatched inside the mother's body. Others are completely live-bearing, and no hatching is involved at all. More » Pets & Animals Reptiles

Examples of the Reptilia, or reptiles, include common garter snakes, chameleons, saltwater crocodiles, tuataras and Galapagos tortoises. There are about 9,500 species in the Reptilia family, the earliest of which evolved... More » Pets & Animals Reptiles

Some reptiles that live in caves include salamanders, snakes and frogs. These reptiles go to the caves to find a cool place to get away from the summer heat. Salamanders are a common reptile in U.S. caves, particularly i... More » Pets & Animals Reptiles