The Bocas del Polochic Wildlife Refuge is a wetland formed by the mouth of the Polochic River in Lake Izabal, Guatemala. This ecosystem, formed by forest, floodplains and rivers. It houses more than 250 species of birds and important populations of mammals, reptiles, amphibians and fish. The wildlife refuge covers an area of 20,760 hectares (207.6 km2), which includes terrestrial and aquatic ecosystems. In addition to the diversity of birds, Bocas del Polochic has populations of other fauna groups. The largest population of the manatee in Guatemala, the howler monkey and otters are reported in the refuge. Studies have determined that in this Wildlife Refuge inhabit at least 250 species of resident and migratory birds, 39 species of mammals, 138 species of reptiles and more than 53 species of fish.