This is full of facts about this Arctic animal: where it lives, what it eats, how it gets its food, when it mates, how it rears its young, and the dangers it faces. Temperatures are given in Fahrenheit and Celsius, weight in pounds and kilograms, height in feet and meters. Despite minor flaws, this book will be a useful introduction to these magnificent animals, and readers will be enticed by the appealing illustrations, many of which are labeled.