When you use Survey Wildlife to Recall Knowledge about the creatures whose marks you've seen, what skill do you roll against? Does the GM use whichever of Arcana/Nature/Religion/Occultism the creatures fall under, or do you use Survival (making SW much more useful)? Or does only Nature ever apply and you'll just fail to identify non-Nature creatures?
I guess you use the normal skill for the Recall Knowledge check as for identifying creatures.
So Divine for undead, Nature for animals and so on...
"Attempt a Survival check against a DC determined by the GM
based on how obvious the signs are. On a success, you can
attempt a Recall Knowledge check with a –2 penalty to learn
more about the creatures just from these signs. If you’re a
master in Survival, you don’t take the penalty." Based on wording, you use the standard creature's RK skill (arcana/crafting/nature/occult/religion/society), and it just lets you make a RK without looking directly at the thing.