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Children's LiteratureBirds are part of the animal kingdom. They are vertebrates, which means they have backbones. Most birds have hollow bones that enable them to fly. They are warm-blooded; their body temperature stays the same regardless of the weather. Birds use food to generate energy that keeps them warm. All birds have the same body parts; a head with two eyes, a bill, two wings, two legs and two feet. Their skin is covered with feathers. Birds are the only animals that have feathers. Birds eat many different kinds of food. Some birds eat seeds while other birds eat small animals. Birds hatch from eggs. A hummingbird can perform an amazing feat. They can fly backwards, sideways and upside down. They flap their wings 70 times per second. This book is part of the "Exploring the Animal Kingdom" series. Large type, simple text as well as engaging photographs make this series very accessible to the youngest students. 2005, Capstone Press, Ages 5 to 9.