Bicho-preguiça (sloth or "Bradypus torquatus"). Photo by Stefan Laube/ Wikipedia
There are almost 700 different species of mammals in the country. Wikipedia has a pretty complete list. And these are some of the best images found on Wikipedia and Flickr.
Tatu-galinha ("Dasypus novemcinctus"). Photo by U.S. Fish and Wildlife Service/Wikipedia
Peixe-boi amazônico / Amazonian manatee ("Trichechus inunguis") photo by Chris Muenzer/WikipediaGambá / opossum ("Monodelphis domestica") . Photo from Wikipedia. Original Source: Plosbiology.org
Anta / tapir ("Tapirus terrestris"). Photo by Miguel Vera/ FlickrCapuchin monkey ("Cebus capucinus"). Photo from Wikipedia. Original Source: Plosbiology.org
Macaco-parauacu/ white-faced saki ('Pithecia pithecia") by the wonderful Ana Cotta/Flickr
Sort of sad. Tamanduá-mirim / Anteater ('Tamandua tetradactyla". Photo by temaki/FlickrQuati, photographed on Anchieta Island, state of São Paulo, by Leandro Coelho/ Flickr