Peru has the third largest extent of tropical rainforests in the world, after Brazil and the Democratic Republic of Congo. These forests are some of the richest in the world, both in terms of biological diversity and natural resources (timber, energy, mineral resources). Peru has some 2,937 known species of amphibians, birds, mammals, and reptiles, according to figures from the World Conservation Monitoring Centre. Of these, 16.0 percent are endemic, meaning they exist in no other country, and 7.6 percent are threatened. Peru is home to at least 17,144 species of vascular plants, of which 31.2 percent are endemic.