On silent wings a bird sweeps down in the moonlight...   With their striking appearance and distinctive hoot, hoot, owls are one of the most recognizable birds in the world.  But did you know there are more than 140 types of owls living in the world?   Gail Gibbons' Owls celebrates the similarities and differences in the many species of owls, from large to small, living in diverse environments and making many different kinds of nests.  The book covers basics of owl behavior, information on how they hunt, and the many factors that have led some types of owls to become endangered.   The boldly colored illustrations feature clear labeling, and all new words are defined and reinforced with clear, simple language, appropriate for young readers.  The book also features a page of intriguing owl trivia.   Gail Gibbons “has taught more preschoolers and early readers about the world than any other children’s writer-illustrator.”  Ms. Gibbons is the author of more than 100 acclaimed books for young readers, including the bestselling titles From Seed to Plant and Monarch Butterflies. Her many honors include the Washington Post/Children’s Book Guild Nonfiction Award and the NSTA Outstanding Science Trade Book Award.