Palo Verde is a national park and conservation area in the north west of Costa Rica established in the 1970s. The issue here was that among this great and wonderful valley, cattle ranchers had for many years let their animals roam freely until the importance of this area for biological diversity was recognized. Palo Verde is a dry tropical forest that runs down the large rocky hills into the Rio Tempisque river valley. Rio Tempisque (Tempisque River), coils through the park between massive uprisings of rock and earth creating habitats for many species of birds, some migratory, some permanent residents, and some rare species. The massive wetlands have been recognized as internationally important, students and researchers from all over the world travel here to study.