Okay, Charley, you've nudged me on...
Obvious repeats omitted to save typing:

Witonotitan wattsi once stopped beside a billabong
joined by Diamantinasaurus matildae,
and they slid and got stuck and they died there in that billabong
It seems like a result of evolution to me

then came Australovenator wintonensis looking for an easy meal
He saw them in muck and leap in with glee
and he slid and got stuck and he died there in that billabong
It seems like a result of evolution to me

Next came a scientist encumbered with the latest gear
he bent o'er a fossil in a pile of debris
and he slid and got stuck and he died there in that billabong
It seems like a result of evolution to me

In the distant future the progeny of ticks and bugs
will look into some gooey swamp and what will they see?
The fossilized remains of scientists and motorcars
The end of evolution for all humanity

Okay...not my best work. I can't take the pressure, man.