These are fine. You also know, I am sure, that you can talk about the animal in general: snails crawl, move...
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Vincent TeoThanks!! I thought "crawl" is incorrect! Now, it's is acceptable!! Thanks!!Now that you mention it, 'crawl' might be incorrect, at least in terms of how people crawl. It still seems natural to me, however.
Vincent TeoThe snails is slipping slowly.Personally, I wouldn't use it. "Slipping" is what you do on the ice, or a wet soapy floor, or a banana peel. At any given moment, he's pretty well stuck to the surface.
optilangAnd according to this site snails slide or glideHi, Optilang.