Fish - Animal Facts Author:Heather C. Hudak Fish come in a huge variety of shapes and sizes. What do they have in common? What makes them distinct from other classes of animals? Animal facts solves the puzzle of the similarities and differences among animals in the same class with itext and photographs. The basic classes of the animal kingdom are described in the animal facts series. Read... more »ers will learn about the history, life cycle, habitats and diets of various animals. They also learn how different species adapt to their changing environment and how some animals are being threatened.« less