Everybody loves Perry's adorable "chittering" noise. But no one knows what it means. Phineas and Ferb decide to find out by building an animal translator. With the help of the invention, will Perry finally be able to speak to the boys? Featuring exciting full-color art from the show, this second installment of the Phineas and Ferb Level 3 reader series is perfect for fans who are ready to read on their own.