Our Australian native snails are NOT vegetarian i.e. they will not eat your garden plants. They eat fungi, micro-algae on the leaves of plants and biofilm on most surfaces.
Our largest land snail, the Giant Panda Snail (Hedleyella falconeri), happily searching for food in the rainforest. It won’t eat your garden.
Some snails are carnivorous even following the slime trails of other snails in order to have a feast. Here, an Asian Tramp Snail (Bradybaena similaris) is dinner for a Glossy Turban Carnivorous Snail (Terrycarlessia turbinata).
Eating tracks from the red form of the Red-triangle Slug (Triboniophorus graeffei) found at Mt Kaputar, NSW. This large red native slug is shown here. It like the other forms of Triboniophorus graeffei including the red triangle slug, eat the biofilm off the tree trunks.