Jalisco is made up of a diverse terrain that includes forests, beaches, plains, and lakes. Altitudes in the state vary from above sea level, from the coast to the top of the Nevado de Colima. The Jalisco area contains all five of Mexico's natural ecosystems: arid and semi arid scrublands, tropical evergreen forests, tropical deciduous and thorn forests, grasslands and mesquite grasslands and temperate forests with oaks, pines and firs. Over 52% of the bird species found in Mexico live in the state, with 525, 40% of Mexico's mammals with 173 and 18% of its reptile species. There are also 7,500 species of veined plants. One reason for its biodiversity is that it lies in the transition area between the temperate north and tropical south. It also lies at the northern edge of the Sierra Madre del Sur and is on the Trans-Mexican Volcanic Belt, which provides a wide variety of ecological conditions from tropical rainforest conditions to semi arid areas to areas apt for conifer forests.