The variety of bird species is truly astounding, from the tiny bee hummingbird to the towering ostrich, making birds one of the most diverse and successful animal groups on the planet. Taking you inside their extraordinary world, this overview explores all aspects of these remarkable creatures, providing an awe-inspiring look at their physiology, evolution, and behaviors, including migration and navigation. Featuring hundreds of color illustrations, this guide also assesses the challenges they face, and notes how humans have used them for inspiration, companionship, and food.