You might be right. I was posting from a childhood memory...
Well, your response made me go look it up. Here is the first few verses.
A long time ago, when the Earth was green,
There was more kinds of animals than you’ve ever seen.
And they ran about and played while the Earth was being born,
And the loveliest of all was the unicorn.
There was green alligators and long-necked geese,
Some humpty backed camels and some chimpanzees.
Some cats and rats and elephants, but sure as you’re born,
The loveliest of all was the unicorn.
The Lord seen some sinning and it caused Him pain.
And He said, “Stand back, I’m going to make it rain!”
He said, “Hey, Brother Noah, I’ll tell you what to do,
Go and build me a floating zoo,”