I always advise bringing a birding field guide with you to help you identify the birds you see.  Your guides will know the birds but especially in Brazil, they may not speak English……….but they can definitely point to the right photo in the book.  This guide is very comprehensive and covers birds from the whole country.  Some of the reviewers feel the book is a bit heavy to carry but most of them were happy with the quality of the guide.  This is my affiliate link, I do appreciate your support if you use it to click through for any of your Amazon purchases.