We all know that there are many birds up in the sky, but did you know that there is a similarly vast number down here on the ground? The bird kingdom is weird, wonderful, vivid, and fascinating. This encyclopedia will introduce you to over a hundred of the world's best-known birds, and it will give you a clear idea how birds are classified. You will find an attractive selection of birds of prey, parrots, penguins, songbirds, and aquatic birds from practically every corner of Planet Earth.