Across the street from the entrance to Parque Nacional do Iguaçu is Parque das Aves (Bird Park). With several species of tropical birds from all over the Brazilian and South American rain forests, it is well worth a visit. It also supports a good cause, as most of the birds are rescued and being rehabbed. The park is open from 8:30am to 5pm. Admission was BRA$28 at the time of posting.
The coolest part of the complex are the open cages where visitors can walk right up to colorful birds like toucans and macaws. Try not to get pooped on!
Other attractions include a butterfly cage, tarantulas, and the chance to hold parrots near the gift shop.