Turtles are fascinating reptiles that have been around for millions of years. There are over 300 species of turtles, and they can be found in a variety of habitats, from deserts to oceans. Turtles are ectotherms, which means that they rely on external sources of heat to regulate their body temperature. They have a hard shell that protects their internal organs, and they use their claws to dig, climb, and swim.