Approximately 10,000 different species of birds inhabit our planet, and they exist in all kinds of environments, from deserts to the Antarctic, from the open sea to impenetrable tropical forests, from swamps to mountaintops, to even cities and towns. This book offers young readers examples of the stunning variety of birds that live in our world -- from the largest ostrich at 5-feet tall and 330 pounds, to the smallest hummingbird at 2 inches long and weighing barely an ounce.