Down
| 1. | Two organisms of different species that live together. |
| 2. | A layer of fat under the skin of some animals (such as walruses and polar bears) that live in cold places. |
| 3. | The shedding of exoskeletons, feathers, skin, or hair when animals grow. |
| 4. | Hibernating animals can survive on its existing body ____ for months. |
| 5. | ____ animals are active during the day, but inactive at night. |
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Across
| 2. | An underground tunnel-like home dug by animals. |
| 6. | Two organisms of different species that live together with one clearly benefiting from such living arrangement and the other neither benefiting nor suffering from the partnership. |
| 7. | The long distance travel that many animals exhibit. Birds and whales do this to live in places with the best weather conditions. |
| 8. | The changes of some animals, such as beetles and butterflies, that take place as they grow and mature. |
| 9. | ____ animals are active at night, but inactive during the day. |
| 10. | A ____ behavior is one that depends on experience. |
| 11. | Some animals spend their summers in a state of sleep. This is called ____. |
| 12. | Behaviors that animals are born knowing how to do. They do not need to learn how to do these types of behaviors. |
| 13. | A method used by animals such as bats and dolphins to find their way or to locate prey by sending out sounds and then listening for the echoes that bounce back off objects in front of them. |
| 14. | Animals can learn ____ based on their experiences, such as not to eat a certain food that they have learned doesn't taste good. |
| 15. | Animals, such as vultures and Komodo dragons, that feed on dead or rotting animal flesh. |
| 16. | Two organisms of different species that live together with one clearly benefiting from such living arrangement and the other suffering from the partnership. |
| 17. | Two organisms of different species that live together and both benefit from such living arrangement. |
| 18. | Animals hiberate so that they can conserve or save ____ during the cold months. |
| 19. | A type of instinctive behavior for some animals that live in cold areas to spend the entire winter asleep. |
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