The parks are home to several endangered species including jaguars, tapirs, ocelots and anteaters as well as colourful toucans, parrots and butterflies. Recognized for their high levels of biodiversity, they are both listed as UNESCO World Heritage Sites.
The parks are also part of the Atlantic Forest ecoregion. The Atlantic Forest once covered more than 999,740km2 along Brazil's coast with extensions into eastern Paraguay and northeastern Argentina. It is one of the most endangered rainforests in the world, with only 7% of the original forest now remaining.