I've observed a rather unexpected behavior in my games: NPCs, including animals, seem to absolutely refuse, at all costs, to step on a trap that
can't hold them. That is, while a bear or wolf might step on a pit trap, and therefore get stuck there, they simply will
not step on a loop snare or other bird/hare trap.
With that in mind it comes to mind that a line of loop snares (at 3ft of cord each, pretty cheap with the changes to how tying equipment works) is arguably a highly efficient way of creating a fence around your home or field: Anything small gets trapped (mostly birds. You'll be drowning in feathers real quick), and unless something small creates a whole in your traps, nothing big will cross so as not to disturb your bird traps (very polite bears, even when they want to kill you they wouldn't want to ruin a trap you put there
)
Now, I've yet to set up a test if that's only valid if there's at least one possible untrapped path, or if it also works for when there's no possible path that doesn't hit a trap. If it's the latter, this is very concerning, as it would allow pretty casual killing of anything that doesn't have ranged capabilities (which is to say, npcs with bows or javelins) so long you have enough ammo, but even the latter would be a concern, as it'd make it much easier to fence, trap or prevent enemies from flanking oneself.
Have you observed the same behavior in your games? What do you think on the matter?