A classic British children's language learning primer for pre-school students. This book is easy-to-read, with simple sentences, and adequate repetition. Children can effectively repeat the contents to memorize the material, and enhance their cognitive learning level. "Frogs" and "Birds" are two separate books in a single volume. After reading the book "Frogs", one can read the book "Birds" by flipping the book.

Separate texts bound back-to-back and upside down.