Check out this mom's review from Glass of Wine, Glass of Milk: 

"With questions addressed to the reader, cute animals and simple puzzles on each page, the small paperback picture books invite engagement. They follow a predictable pattern with high interest content and accessible explanations. These Why Do... books are especially fun because after each biological enquiry, a fantastical theory is posited before the true explanation is presented. Little ones will be saying, "No way is a macaw trying to hide in a rainbow!" In addition to the cute illustrations and fascinating facts, photographs and additional information is presented as back matter. These little Why Do.. books are great for kids who love animals or the ocean and promote intellectual curiosity!"