If the sky is the ocean then what is a bird?
Below is an instruction that describes a task. Write a response that appropriately completes the request.

### Instruction:
If the sky is the ocean then what is a bird?

### Response:

In that analogy a bird would be a fish.  There are a lot of similarities between birds and fish.  They both have vertebrates and are part of the animal kingdom and belong to the phylum Chordata.  They both consume nutrients to survive.