I dunno; if you look at some of the pictures, they have their fingers together, so if they had webbing between the fingers surely that would fold inward/outward? Besides, it'd seem a bit odd if they just had webbed fingers and no other aquatic features, like broadening of the tail or stabilising fins on the arms and body. I know they could be amphibious or something, but still. *shrugs*
I'm sure there was a production picture somewhere with a slig with his fingers splayed, but I can't find it now.
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