These streams mostly flow in deep ravines bordered by steep, rocky hillsides. Agriculture is restricted to the few upland plains, open valleys, and terraced hillsides. Open areas including rocky outcrops, fields, pastures, and sparsely wooded hillsides comprise their habitat. Bracken grows in pastures, deciduous and coniferous woodlands, and hillsides. Bamboo holds topsoil very tenaciously, preventing soil erosion on hillsides and riverbanks. They live in forests and deserts, rocky outcrops, and hillsides. It grows in mountain meadows and on hillsides. The preferred nesting sites are on coastal hillsides or cliffs. Bottomland forest is preferred over hillsides and ridges. Most Dumagats are living in the hillsides or mountains. Several plants that grow on the rocky hillsides are unique to the Nairobi area. They appear to be found only among limestone boulders on hillsides. Connecticut has one native cactus (Opuntia humifusa), found in sandy coastal areas and low hillsides. Arabica coffee is grown at 1,200 to 1,800 meters on hillsides and plateaus. Huge statues of the Buddha were erected in monasteries and carved into the hillsides.