Reserve (Isla de Pajaros)These
two small islands were set aside as a biological reserve
in 1973. Their 143.5 hectares are primarily for the
preservation of sea bird nesting areas. The island
of Guayabo is especially known for having one of the
most important nesting grounds of the brown pelican.
These islands are often lumped together with the Isla
de Parjaros Biological Reserve. This later island,
made a biological reserve in 1976, with 4 hectares
of area, has the same reason to exist as do the other
islands, as protection to sea bird nesting sites.