Reptiles are cold-blooded vertebrates with dry, scaly skin, and they typically lay eggs, relying on external heat sources to regulate their body temperature. Articles are a unique way for readers to learn about the world around them. In addition to building reading comprehension skills and increasing vocabulary, articles can be used for writing and research. Animals are broken into 6 single-page sections: What Is, Characteristics, Types, Why Important, Fun Facts, and Words to Know.