Across
- 2. Birds have these covering their legs and feet.
- 4. The process of spreading oil on feathers.
- 7. The group of birds that cannot fly (e.g., ostrich).
- 8. The bone that forms the wishbone in birds.
- 11. The transparent eyelid that moves sideways.
- 12. The chambered organ that pumps blood.
- 13. Birds have these instead of teeth for eating.
Down
- 1. The system that includes lungs and air sacs.
- 3. Birds are ____________, meaning they maintain a constant body temperature
- 5. Birds lay these to reproduce.
- 6. The colorful outer covering of birds.
- 9. The organ that stores food before digestion.
- 10. The opening for digestive, reproductive, and excretory systems.