Alternatively you can also use aluminium. Snails have a natural allergy to aluminium due to a reaction happening between the metal and their slime. Therefore they will avoid aluminium at all cost.

As well as the proportions being flipped, resulting in the now iconic look. IIRC it was supposed to be a pig initially.

Are you sure that a dinosaur laid a chicken egg? Or did a chicken hatch from a dinosaur egg? When does a dinosaur end being a dinosaur and begin being a chicken anyways?

Because even the official name of the problem contains it.