Terrestrial species are organisms that primarily live on land rather than in water. This group includes a wide variety of life forms, such as plants, mammals, birds, reptiles, and insects. These species have adapted to various terrestrial environments, including forests, deserts, grasslands, and mountains. Many terrestrial species play crucial roles in their ecosystems, contributing to biodiversity and maintaining ecological balance. For example, trees provide oxygen and habitat, while herbivores help control plant populations. Understanding terrestrial species is essential for conservation efforts and ensuring the health of our planet's ecosystems.