Guayabo, Negritos & Pajaros Island
Biological Reserves

These four islands -negritos are two- are located on the Gulf of Nicoya. The reason for setting them aside as biological reserves was to preserve the large population of sea birds, together with the local flora and fauna.

Guayabo is an imposing mound that towers 50 meters high. Its mostly composed of sedimentary rock between 60-80 million years old. The vegetation that covers the island consists of shrubs, small plants and thorn bushes. The wildlife, except for small insects and crustaceans like crabs, is exclusively made up of birds, including the brown pelican,  frigate birds, laughing gulls and boobies.

Pajaros Island is almost completely round and dome-shaped.  It's composed of the same kind of sandstone and luttie 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 stinking toe. Resident animals include rock oysters, crustaceans like barnacles, and birds outcasted from other groups.