I have trapped birds using the old cardboard box, bait, and string system. If I were in the woods, I would fashion a latticework box of branches, probably use bread or cracker crumbs to get the birds into the trap.
I wondering if you've given any thought to the type of bait you would use for trapping birds in the event that you didn't have any bread or any cracker crumbs handy. I would prefer to use bread or cracker crumbs or maybe even corn as bait, but it won't be easy to obtain that kind of stuff when the chips are down.
I doubt that bread and crackers and corn will be available in a survival situation.
The good thing about trapping birds is that you don't have to worry about their sense of smell, which is said to be pretty meager, but that said, you've got to know what type of bait to put out, and you've got to know what type of bait is going to attract them if you're hoping to eat something for dinner.
LW.