| 作者 (Author) | Marsh, Laura |
| Summary: Photographs and text describe the migratory behaviors of various animals. | |
| 等级 (MML) | MM Level-4.6 |
| 年级 (IL) | Lower Grades (LG K-3) |
| 字数 (Words) | 1947 |
| 类型 (Fiction) | Non-Fiction |
| 系列 (Series) | National Geographic Readers: Great Migrations; National Geographic Readers: Level 3; |
| Topic: Science-Nature; | |
