The bulk update request #1877 is pending approval.
create alias unknow_(artist) (1) -> unknown_artist (51712)
mass update species_unknown -> species_unknown_(artist)
mass update creature_unknown -> creature_unknown_(artist)
Reason: A lot of posts that had unknow_(artist) actually had artist tags, I assume somebody added that because they didn't realize the artist was tagged in the general category. It had quite a few posts under it which lead to even new posts getting the tag.
Those two artists... Those are not good names for a tagging system like ours. Both phrases sound like they're refering to an unknown species, not to an artist.