Adapted from Duria antiquior the single most important piece of paleoart ever produced. Not a bad version, though censoring out the pooping fish was a mistake.
There once was an Ichthyosaurus,
Who lived when the earth was all porous,
Be he fainted with shame
When he first heard his name,
And departed a long time before us.
Animaux perdus [“Lost Animals” - colloquial term for extinct creatures]
Dictionnaire Pittoresque d’Histoire Naturelle et des Phenomenes de la Nature. F. E. Guerin, 1833.