Jardim Zoológico, in attractive gardens, has more than 2,000 animals of 300 species. Their theme is nature, animals, and ecology. There are the usual feeding sessions and a children's farm. The gardens also provide shaded picnic areas. There's also a dolphin show and row boats.
Just outside the zoo itself is the Animax, an amusement park with restaurants and bars and shops.
Catch the metro, blue line to Jardim Zoológico or a train to station Sete Rios. Many buses also go to stop Jardim Zoológico including numbers 16, 31, 54, 70, 701, 726, 746, 755, and 758.