More than 720 bird species have been recorded in Guatemala. Of the bird species breeding in the highlands, about 10% are endemic to the North Central American Highland, including species such as Highland Guan, Green-throated Mountain-gem, Wine-throated Hummingbird, Rufous-browed Wren, Blue-and-white Mockingbird. The range of some species is even more restricted to only western Guatemala and the south Mexican state of Chiapas, such as Horned Guan, Azure-rumped Tanager, Pink-headed Warbler, Bearded Screech-Owl, and Black-capped Siskin. The highlands are also home to Guatemala's national bird, the Resplendent Quetzal. The Guatemalan lowlands are less distinct and have many birds in common with southern Central America. However, the Atlantic slope is Guatemala's region with the highest species richness. More than 500 species have been recorded there.