The Cerrado has a high diversity of vertebrates; 150 amphibian species, 120 reptile species, 837 bird species, and 161 mammal species have been recorded. Lizard diversity is generally thought to be relatively low in the Cerrado compared to other areas like "caatinga" or lowland rainforest although one recent study found 57 species in one cerrado area with the high diversity driven by the availability of open habitat. "Ameiva ameiva" is among the largest lizards found in the Cerrado and is the most important lizard predator where it is found in the Cerrado. There is a relatively high diversity of snakes in the Cerrado (22–61 species, depending on site) with Colubridae being the richest family. The open nature of the "cerrado" vegetation most likely contributes to the high diversity of snakes. Information about Cerrado amphibians is extremely limited, although the Cerrado probably has a unique assemblage of species with some endemic to the region.