 For example, one ichthyosaur is painted with its mouth open about to swallow the fish head-first, just as a predatory fish would swallow another.Several of these animals are also depicted defecating, a theme that emerges in other works by De la Beche.For example, his 1829 lithograph called "A Coprolitic Vision", perhaps inspired by Conybeare's Kirkdale Cave cartoon, again pokes fun at William Buckland by placing him at the mouth of a cave surrounded by defecating prehistoric animals.