### Instruction: Which of the following can fly: bird, cow, cat, dog, car, helicopter, drone, bike, pot, butterfly, feather?
### Response: The objects that can fly are: bird, helicopter, drone, butterfly.
The objects that cannot fly are: cow, cat, dog, car, bike, pot, feather.

However, someone may claim that a feather can fly as well because it's light enough and a mild wind blow could make it fly.