Ages 6 to 12 years. Frogs begin their lives as tiny tadpoles living in water. As adults, they live both on land and in the water. This book details the changes in a frog at the four stages: egg, tadpole, froglet, and adult. Illustrations, photographs, and easy-to-read text explain: facts about how the frog breathes and eats at each stage; differences in the metamorphosis of frogs in southern and northern climates; dangers to frogs from pollution, pesticides, and destruction of habitat.