Now I understand why Callimachus at Done With Mirrors was so exercised about snark:
There's the snark - a horrific snake/shark incarnation that not only swims, but chases you up the beach when you try to flee the water. And the worst one? The tird - a slimy, burpy, warty toad crossed with a bird - which combines my two worst fears into one huge flying, pecking amphibious wretch. Hitchcock could've had a field day if he'd introduced a few of those to the set of The Birds.