Mexico has the world's most diverse collection of reptiles, with 717 known reptile species. Of those 717 species, 574 of them are only found in Mexico. Mexico is the #2 country in the world in diversity of mammals, with 502 species, and #4 in amphibians, with 290 known species. Mexico is home to 290 bird species, with 1,150 avian varieties. As far as plants go, Mexico is #4 worldwide in flora, with 26,000 known species.