Here's a song that touches on the issue of where birds came from...though the exact manner of this theory is questionable. Oddly, the chorus doesn't happen every verse. And the word in ** is pronounced with a faint note of disgust.

Quoth one Triassic dinosaur, "I'm tired and I'm bored.
My kin have conquered land and sea, but few have ever soared.
And should I not aspire to heights? Above me is the air.
Move over bugs and pterasaurs, for I shall soon be there.

(chorus)
Set me free, I want to be a bird.
The great primeval urge to fly within my breast is stirred.
Set me free, I want what flying brings.
Change these scales to feathers and these forearms into wings!

Well, he flapped his arms and flailed his tail and wiggled a toe or two,
But just fainted from exhaustion, saying, "This will never do!"
He gave a good long running start; it surely couldn't hurt,
And gave a leap - but crashed to earth - his muzzle in the dirt.

"There must be some neat trick," he thought, "to launch me into flight."
So in his mind, he jumped from cliffs but - no, that wasn't right.
In resignation, he retired into a tree nearby;
"It's just no use. I'm not the type. I'm never going to fly.

But...(chorus)

Well, soon, a rival dinosaur passed close by underneath.
Our friend, a territorial beast, sat up and bared his teeth.
He spread his arms out to the side, his colors to display,
And as he did - the wind came up - and carried him away.

So proud was he of his success, he soared back to the tree
To pass his newfound prowess on to all his progeny.
And in the late Jurassic, his offspring won their wings,
And grew bird feet, and rimidges, and other birdy things.

So now birds populate the Earth, their bodies cloud the sky
Since that one aspiring reptile went and taught himself to fly.
We've eagles and we've finches and we've *pigeons* by the score,
Who owe their great success to that pre-co-scious di-no-saur,
Still singin'...

(chorus)