Unique species are organisms that possess distinct characteristics not found in other species. These traits can include unusual physical features, behaviors, or adaptations that help them survive in their specific environments. For example, the Axolotl is a unique species of salamander known for its ability to regenerate limbs and retain its juvenile features throughout its life. Many unique species are often endemic, meaning they are found only in a particular geographic area. The Galápagos Islands are famous for their unique species, such as the Galápagos tortoise and the Darwin's finches, which played a significant role in Charles Darwin's theory of evolution.