If you impassion yourselves for ornithology, you will visit with pleasure Parks it Nacional Palo Verde, where 279 species of birds were listed. The aviary richness of the park is due mainly to the fact that this last shelters a dozen of the types of natural habitats. Among those, one finds the forest tropical dry of low altitude, made up of timbered hills, lagoons of salted water and fresh water, mangroves, marshes and great grass extents. Moreover, a great part of the territory is flooded by the abundant rains and the overflow of the rivers Tempisque and Bebedero, which skirt the park. The drainage of water being carried out only very slowly, the large grassy plains are converted then into marsh lasting a few months, thus modifying the decoration of the park. These wet coastal areas being rather rare in Guanacaste and elsewhere with Costa Rica, one decided, in 1992, to include Parks it Nacional Palo Verde in the International Convention of Ramsar.

But there is not that wetlands or flooded in the park, because this one contains approximately 150 species of trees identified to date, in particular the palo verde (green heart), a tree whose trunk, branches and sheets preserve their green color throughout the year. It is found this gasoline mainly in the marshy zones of the park. In April 1978, Nacional Palo Verde Parks it, of a surface of 16 804 ha, was initially an ecological reserve, for then becoming, June 13, 1980, a national park.