| GMD | Text |
| Classification | 599.5 MAR |
| Publisher | Washington, D.C., National Geographic, 2010 |
| Subject | Parental behavior in animals -- Juvenile literature.Sperm whale -- Migration -- Juvenile literature. |
| Topic | IPC |
| Series | National geographic little kids.National Geographic kidsExplore my world |
| Description | 48 p. : col. ill. ; 23 cm. |
| ISBN | 9781426307454 |
| Suitable | From 9 To 12 |