The Cold-Blooded Ones are called that because they lack the ability to keep warm by using their bodies. Since these animals need to regulate their body temperatures, the Cold-Blooded Ones use their environment to help them do this. A turtle will find a sunny spot to bask in. A salamander will move under a rock for warmth. Toads will bury themselves in the dirt. Snakes prefer living in rocky dens for warmth and under leafy bushes for coolness.
Reptiles are one of the most ancient forms of life, and also one of the most adaptable. Both the turtles and crocodiles have survived the dinosaurs, while remaining the nearly same today as they were in the past. In addition, crocodiles are distant relatives to birds and dinosaurs. Snakes and lizards have expanded the ways that reptiles adapt to their environment. Snakes lost their legs, while lizards adapted to life in the ocean. Meanwhile, worm-lizards (ringed lizards) have evolved to burrow underground by using their heads.
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