"There are many jewels in nature, but perhaps the most beautiful are those that fly--hummingbirds." Dedicated hummingbird enthusiasts and world travelers, the Tyrrells bring their passion for these "jewels in the sky" to life in this eye-catching book. Even nonnature lovers will find the hummingbird intriguing as it is presented here, from the information that "the hummingbird's heart is the largest, in relation to its body size, of any animal on earth" to the discussion of its honored, sometimes revered status in the Aztec, Hopi, Tewa, Cherokee, and Jamaican cultures. Physical characteristics and feeding, mating, and nesting habits are explained simply but with enthusiasm. The vivid stop-action photographs are striking, displaying many kinds of hummingbirds engaged in a variety of activities. At times, the photographs show a hummingbird next to an object a child will recognize, such as a penny or a ruler, to demonstrate the bird's size. This excellent introduction to the world of birds may very well spark an early interest in science and nature. A section on attracting hummingbirds and one on the 16 species of hummingbirds in the U.S. are appended.