Across
- 1. The only birds that can fly backwards.
- 3. Short stiff hair.
- 8. The long distance movement of animals to escape from harsh climate conditions.
- 9. Replacement of old worn out skin.
- 10. The back legs of mammals.
- 11. A network of air tubes in insects.
- 12. A body movement by the use of scales.
Down
- 1. Deep winter sleep in cold weather.
- 2. Dome shaped muscle.
- 4. Breathing holes in an insect's body.
- 5. Aquatic mammal.
- 6. A special mouth part in bees and butterflies.
- 7. Breathing structure in a fish.