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Not only can snails go inside their shells for protection...
they can also retract inside their own bodies.
Some snails have 2 tentacles, and some have 4
The 2 shorter tentacles are used for smelling and tasting
Snails move using muscular contractions in their foot, which is their entire belly..
Snail slime, or mucus, helps snails move over rough surfaces.
The stickiness also helps them climb up vertical surfaces.
They secrete mucus on their skin to keep it from drying out