World has several original species that should always be included in this tag
acorn_bug post #3468562
arrowbird post #3543756
hydromel post #3341373
gnatscale post #3612929
hayim_(species) post #4193753

There are also several species that can't be found by search such as that worlds goblins post #4188259 , kobolds post #4237587 and a plant species post #4023255 due to not having any way to differentiate them by tag.

World by NarglFargl, they don't appear to have a species index anywhere and since it's mostly if not entirely by commisions it's drawn by various artists.