Well, no, but I can add the first verse of the original (unicorn) song and maybe our collective brain can remember/invent a plausible first verse based on it

A long time ago when the Earth was green,
There were more kinds of animals than you've evr seen,
There were cats and rats and elephants as sure as you're born,
But the loveliest of all was the unicorn.

Now, I'm sure the third line must mention quantum mechanics or QED or something. The first and second lines might get away with really minimal change, if you like.
Come on folk(ie)s let's put this song back together so it works again.