I have a couple of issues with the bird thief quest, and think they can be dealt with reasonably easily:
1. It doesn't make sense to have to "relearn" the ritual in the quest every time: once the ritual is known, it should be possible to bypass the learning steps by getting the dialog option that the character already knows a ritual to get a bird thief to confess. I haven't tried to actually short cut it to see if it works as I'm not sure it might break the quest.
2. It makes sense that a lost victim of robbery is hazy about the whereabouts of the robbers, and it makes some sense that a traveling adventurer doesn't keep detailed note of where his shelter is built, but a bird trapper should know the location well and be able to give fairly precise directions. To make the matter worse with this quest is that the traps are few and not easily seen (they don't stand out like blood scapes, and if they're scattered over the tile I haven't found it), which makes them very easy to miss when placed in terrain with a lot of spruce, as the line of light is rather limited there.
It would be easier to find the traps if they're always placed reasonably close to the terrain feature border (that may be the case already) so you're sure to find them if you pass through the tile along the border.