I cant answer how any other way than with their mouths! but they do eat lettuce, apple cucumber, cabbage and other fruits and veggies. you should also feed cuttlefish $ egg shells for calcium.
It is not advised to feed celery to snails as it's been known to kill them.
Apple Snails will eat other snails if you don't feed them. If you feed them, then they are alright.
Most apple snails are plant eaters that eat a wide range of vegetation. You can feed them common vegetables and fish food.
They feed them snails, and lizards.
All snails that I know of eat algae.
They won't eat it...
snails eat algae and aquatic plants
Radula
feed it more often
Slug pellets or salt.
Snails like grass leaves and they are also very partial to paper.
Sea snails are pteropods and are an essential food for bowhead whales. These snails feed on phytoplankton and gather in big groups that discolor the water.