"Monarch butterfly populations have been declining for the last two decades, and scientists aren't sure why. This book takes readers on a quest to discover what is happening and what scientists know"--Provided by publisher.
"Zebras travel across the Kalahari Desert each spring in search of food. Whales swim to warmer water every winter. Take a journey to discover the wonders of migrating animals, including why they migrate and how far they travel"--Provided by publisher.
"Read about . . . animal migrations by air, from the . . . migration of the godwit between Alaska and New Zealand to the long-lasting journey of the monarch butterfly across North America. Facts and obstacles are highlighted, and a sidebar details how humans impact each migration"--Provided by publisher.