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Hypercompe sp.
Kirsten... You are perfect...'
http://davesgarden.com/guides/bf/showima...
Looks a lot like a Giant Leopard Moth (Hypercompe scribonia) but Brazil is out of range for that species. There are several local-to-Brazil species of Hypercompe but I don't have a good guide. There are more than 80 species in Central and South America
More here: http://www.nic.funet.fi/pub/sci/bio/life...