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- 3. There are one to two billion living birds on this planet.
- 6. The characteristic feature of all birds is the feather
- 8. Air sacs make up 1/5 of the body volume of a bird.
- 11. The shape of a bird's beak directly corresponds to the type of diet
- 17. Birds have a reduced sense of taste as compared to other animals
- 27. Birds have great economic and personal value to people