Purple Cow

I 've never seen a purple cow, but I heard there was a blue one. Paul Bunyan said Babe was an ox and that Babe was a very blue one. I don't think it matters anyhow, but I believe an ox is still a cow. Yet, I still doubt the claim is true; that Babe the ox was really blue. Now, I didn't know Paul Bunyan well, but I s'pect his story's a tall tale.