The Pantanal, which long ago was a sea, is made up of lowlands flooded by the Paraguay River and its tributaries. These waters fertilize the land, revitalizing it and giving birth to wild flowers and vegetation in abundance. It is the biggest natural fish breeding ground in the world, with the most important species being the dorado (Salminus maxillosus), surubim (Pseudoplatystoma fasciatum) and surubim-pintado (Pseudoplatystome coruscans). The infamous piranha also inhabit the waters of the Pantanal. There are close to 600 bird species, making this a paradise for ornithologists and bird watchers. The local fauna also includes caimans, deer, capybara (the world’s largest rodent), anteaters, porcupines, jaguars, tapirs, pumas, and monkeys.