The largest type of land tortoise is the Galápagos tortoise. Native to the Galápagos Islands, these tortoises can weigh over 500 pounds (227 kg) and measure over 4 feet (1.2 meters) in length. They are characterized by their large, dome-shaped shells and long lifespans, often exceeding 100 years. Galápagos tortoises play an essential role in their ecosystem by helping to shape vegetation on the islands. Unfortunately, they face various threats, including habitat loss and invasive species. Conservation efforts are underway to protect and preserve their dwindling populations.