Young Sluggo was under the same log as the slender salamander. A slug is a shell-less mollusc and this wouldn't be complete without a word from wikipedia,
...the shell-less condition has arisen many times in the evolutionary past, and because of this, the various different taxonomic families of slugs, even just of land slugs, are not closely related to one another, despite a superficial similarity in the overall form of the body.
and...Sluggo is Nancy's age and is a poor boy from the wrong side of the tracks. There are strips that appear to place Sluggo as Nancy's boyfriend. He is portrayed as lazy, and his favorite pastime seems to be napping.
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