Tortoises are primarily land-dwelling reptiles whose sturdy, domed shells protect their bodies. Unlike many aquatic turtles, they have strong, column-like legs adapted for walking on land, and they use a toothless beak to crop food. Many species eat mostly plants, though diets vary. As ectotherms, tortoises rely on their surroundings to regulate body temperature, and their habitats range from dry scrub and grasslands to more wooded environments. The category includes named examples such as Hermann's tortoise and giant tortoises, which illustrate the group's range in size and species. It also includes a prehistoric tortoise subject, connecting living tortoises with their ancient relatives.