1001 Space Earth Nature Evolution Fossils and Prehistoric Life Dinosaurs Simple Animals Insects and Spiders Fish Amphibians Reptiles Birds Sea Mammals Land Mammals Plant Kingdom How Plants Live Unusual Plants Ecology Conservation Animal Behaviour Pets and Farm Animals History Human World Science and Technology

Choose a Page:How do birds hunt prey?Which is the most numerous bird?*Why do some birds fly away in winter?*Which birds live the longest?Which birds are used as symbols?Why do other birds raise cuckoo ch...Which bird sleeps in the air?Why do hummingbirds hum?Why do some birds have bright, sho...How deep can a bird dive?When did the first bird live?How many types of bird are there?How fast can an ostrich run? Why do some birds fly away in winter? Some birds live all year in one place. Others spend the summer months in one part of the world and, as winter approaches, they fly off to a warmer region in search of food. Such journeys are called migration.   Previous: Back Book: 1001 Section: Nature Chapter: Birds