Birds sing and frogs croak. Birds Singing and Frogs Singing is a book published by Tiandi Publishing House. The writer is Nick Arnold. Suitable for people aged 6- 12. He has won the International Popular Science Book Award "Aventis Youth Award" for many times. It has been published in 25 countries and regions with a sales volume of over 20 million copies. "Birds Singing and Frogs Singing" is a set of popular science cartoons, which introduces birds, frogs and ants. It is not only interesting, but also informative.