Flight of the Butterflies (Penguin Young Readers, Level 3)

Starting from the northern United States and southern Canada, millions of Monarchs converge every fall in one region in central Mexico. It's not only an amazing sight to behold for the lucky residents of the area, but also a true miracle of nature. This easy reader follows the 2,500 mile-long journey of the Monarchs, with both full color illustrations and photographs.