Could you tell me which is correct in the following situation:
I have one parrot, its feathers are of different colors. Which is the correct way to speak about the parrot:
- I have a parrot. It is blue and white and green and yellow.
- I have a parrot. It is blue, white, green, and yellow.
Some say that the 1st variant is obsolete, the second is correct. Others tell me the 1st is correct, while the pattern of enumeration in the second option suits the situation when one speaks about several objects, not one.
So which one is correct? May be you can suggest a grammar book where this rule is stated?