5What's more exciting than spotting a flitting humming bird on a flowering bush? Readers won't be able to stop trying to find one after reading this engaging book! Some of the smallest birds on Earth, hummingbirds use a long tongue in a long, thin bill to drink up nectar in flowers. They're known for flying up, down, and even upside down! Low ATOS text pairs with full-color photographs to introduce readers to one of the prettiest, most interesting types of bird.