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It's a blue bird with white belly and black head/collar, with about 30cm from head to tail. It has bright blue spots over the eyes and in the back of the head.
Found just outside a Bird's Zoo in Foz do Iguazu, Brazil
I tought it was a Gralha Azul (Cyanocorax caeruleus), a very common bird in souther Brazil. Couldn't find more information on this beauty (well, I am just starting this 'identify the species' thing) ;)