107 bird species have been recorded and according to Ramsar Site Information Services, there are 12 migratory species, 15 endemic species, 2 vulnerable species and 1 threatened species. It is therefore considered an ancestral refuge for the birds that still nest on the island. It is probably the only known nesting site of Amazona autumnalis (threatened species). Several species of shrubs native to the dry and semi-dry coastal ecosystems of this region have also been recorded in this area. Some trees such as: the palo prieto, the cascol, the porotillo, the guaganaderas chapelà and the fernán sánchez are present in this natural refuge that is the result of the accumulation of sediments brought by the Daule and Babahoyo rivers during thousands of years.