Jerry is a very small snail, much like a land snail. In the episode "Dumped," SpongeBob compared him to Gary the Snail and Lary the Snail, saying, "And Gary and Lary are really different than Jerry" and then took him out of his pocket.
He is an actual snail, not an animated one.
Since Jerry is a land snail, it is unknown how he is able to breathe underwater.
"We paid ten dollars for this?"
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