Guayabo, Negritos & Pajaros Island Biological Reserves

Size: 6,8 – 80 and 3,8 hectares respectively.
Distance from San José: 118 kilometers.
Dry season: January to March.
Camping: Not permitted.
Trails: On Guayabo Island.


These four islands (negritos two) are located on the Gulf of Nicoya. The reason for setting them aside as biological reserves was to get the large population of seabirds, together with the local flora and fauna.
Guayabo is an imposing hill, the 50-meter high towers. Mostly composed of sedimentary rock from 60 to 80 million years old. The vegetation that covers the island consists of shrubs, small plants and thorns. The animals, with the exception of small insects and crustaceans such as crabs, are exclusively birds, including brown pelicans, frigate birds, laughing gulls and boobies.
Pajaros island is almost round and dome-shaped. It’s the same kind of sandstone and Lutti together as Guayabo island. The vegetation consists of a low-growing forest and patches of second-growth grass. The predominant species are guava, crown fig and stingking toes. Resident animals include rock oysters, crustacean like barnacles, birds outcasted from other groups.
Negritos Islands are composed of basalts that belong to the Nicoya Complex. They are frangipani with semi-deciduous forest, in the predominant species covered spiny cedar and gumbo-limbo. Monkey Head is a medical creeper found in abundance here. Some of the animals that live on this island are the raccoons, parrots, doves, hermit crabs (which are very numerous), brown pelicans and oysters. There are some populations of dolphins, tuna and mackerel around the island also.