Explores the life and habitat of this extraordinary species. The lively text describes the spectacular migration of about 90 per cent of the world's monarch butterly population to the high mountain ranges of Mexico. Researchers now know that all monarchs east of the Rockies fly over 2000 miles in vast swarms at speeds of up to 30 miles per hour and altitudes up to one mile. Since the life span of a monarch is less than a year, this epic migration is accomplished by butterflies who have never before seen their destination.