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Fauna and Flora
Four ecosystems are present in the archipelago: coastal marine; dense ombrophilous kills; restinga; mangroves. The first three are marked by secondary vegetation, due to the anthropic action, being the mangroves the systems less affected, presenting, also, primary vegetation. Mangroves present great density and presence in all the most significant habitats, not only because of their specific value as an ecosystem, but also as an economic resource and stabilizing element of the islands.
The Atlantic Forest, characteristic of the region and with a high degree of naturalness representative of the primary forests, is present in significant spots, constituting an ecosystem of great conservation value. In these forests there are exceptional specimens of Camaçari, Jataipeba, Jequitibá, Louro, Pau D'arco, among hundreds of other species of great ecological value.
The vast Atlantic coast of the Cairu archipelago is a complex ecosystem of coral reefs, sandy beaches and banks, and shallows stretching as far as 4 km from the coastline. In the controsta channels, the exuberance of mangroves and seriibas.
The terrestrial fauna of the islands, in particular the mammals with some size does not present great variety, being the occurrences referred essentially of foxes, armadillos, anteaters, otters, small monkeys, juparás and lizards in general. All are species strongly threatened by human occupation. On the other hand, the islands are very rich in avifauna that find habitat and shelter in the forests and forests in permanent terms and in the migratory corridors of the islands uninhabited in the channels, where the mangroves give them protection and food. The most important cases are the islands of Manguinho, Patos, Papagaio, Sabacu Grande and Sabacu Pequena and Mucurandiba.