Reptilian hearts, largely similar to amphibian hearts, are three-chambered and provide moderate separation of oxygenated and deoxygenated blood with their two atria, one which receives oxygenated blood and one which rece... More » Pets & Animals Reptiles

Among the adaptations reptiles have made to live on land is the ability to lay eggs on land. This is in contrast to amphibians, who lay their eggs in a watery medium. Reptile eggs often have leathery shells, which keeps ... More » Pets & Animals Amphibians

There are about 200 species of tortoises that live around the world, but all tortoises have certain features that set them apart from turtles and other reptiles. More » Pets & Animals Pets Pet Reptiles
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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

Cold blooded does not mean reptiles have cold blood. They are, however, referred to as “cold-blooded” animals because of how they regulate their body temperatures through a process called thermoregulation. More » Pets & Animals Reptiles

Some reptile species, such as many snakes and lizards, ambush prey that wanders too close, whereas other reptiles are prowlers that search far and wide for prey. Some reptiles even graze grasses and forage over long peri... 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