I don't really like the idea of hairy sligs. Maybe if their hair is very fine and patchy (finer and patchier than MeechMunchie's interpretation), then I'd be okay. Since Sligs evolved from swamp-dwelling creatures, I can't see the need for hair, other than perhaps as some kind of sensory organ. You could argue that pigs are hairy mud-dwellers, but pigs are actually very clean animals by nature and only lie in mud to cool off and keep nits at bay. Also, besides the correlation between pigs/cops, I think it's safe to say that Sligs in no way resemble pigs. Nor should they.
I always imagined Sligs evolved from some fleshier offshoot of mud bugs, more amphibian/crustacean in nature than mammal.
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