About 140 different species of trees have been identified inside the park.
Due to the fact that the park is located in a transition area between the dry and wet forest, there exists a combination of evergreen trees (never loose their leaves) which are characteristic of the humid rainforest, and trees of the deciduous type (which loose their foliage during the dry season) and are characteristic of the dry forest.
Among the dry forest specimens found we can mention the "Pochote" (Bombacopsis quinatum), the "Guacimo" (Guazuma ulmifolia), and the "Indio Desnudo" (Bursera simaruba) but there are many trees present that are native to the whole Nicoya Peninsula area.
Among the evergreens is worth mentioning the tall and impresive "Espavel" (Anacardium excelsum), the "Guacimo Colorado" (Luehea seemanii), and the beautiful "Cortez Amarillo" (Tabebuia ochracea) which bursts into a yellow spectacle of flowers during the dry months of March and April.
There is a considerable variety of mammals in the park.
Predominant among these and very easily spotted by visitors are the Howler (Alouatta palliata) and the White-face (Cebus capuchinus) monkeys.
Also very abundant and easily seen are the White-nosed coati (Nasua narica) and the White-Tailed deer (Odocoileus virginianus).
Also present, but harder to spot are the Margay (Felis wiedii) and the coyote (Cannis latrans).
But the greatest wealth in fauna is in the abundant marine birds, fish, crabs and mollusks found in the shore waters and in the Cabo Blanco island.
Worth mentioning is the healthy population of brown bobbies and pelicans found in the island, and also the plentiful Conch (Strombus galeatus) found on the park's waters.
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