 In the animal kingdom, there is general consensus that Brazil has the highest number of both terrestrial vertebrates and invertebrates of any country in the world.This high diversity of fauna can be explained in part by the sheer size of Brazil and the great variation in ecosystems such as Amazon Rainforest, Atlantic Forest and Cerrado.The numbers published about Brazil's fauna diversity vary from source to source, as taxonomists sometimes disagree about species classifications, and information can be incomplete or out-of-date.