Creationism apologist (or not :-) ) Jim H. sent me this image after seeing my timeline History of Everything, the YEC side of which I wholeheartedly endorse.
Saith Jim H: "But...but...but...what about this? How can this not be true?"
Well Jim H., be happy, and prance with fife and timbrels, for I tell thee it IS true!
According to rarely published sacred tomes, a couple of weeks after Creation had been wrapped up and while still in the planning stages for what to do with it, the Lord decided to have a dress rehearsal for 'Riding into Jerusalem' (yet to be built, but just getting in early). A mount of suitable stature was chosen.
Alas, the test drive did not go well - the tiny brained creature wanted to walk sideways most of the time and the stench of its excrement was strong enough to drop a horse.
So the Lord smote all the dinosaurs, in his Infinite Mercy, and he spent the next few thousand years picking something else. He picked a donkey. Go figure.
If it were me, I'd have gone with the air-conditioned and palmfrond-proof PopeMobile, but hey, its His Universe.