A carapace is a hard, protective shell that covers the back of certain animals, primarily found in species like turtles, crabs, and lobsters. This structure serves as a shield against predators and environmental hazards, providing both physical protection and support for the animal's body. Carapaces are made of a tough material called chitin, which is also found in the exoskeletons of insects. In turtles, the carapace is fused with the ribs and spine, making it an integral part of their anatomy. The design and thickness of a carapace can vary significantly among different species, reflecting their unique habitats and lifestyles.