I made a large funnel type trap a while ago, been trying to get it working again this spring before the sheep start lambing. I'm having trouble with birds escaping back up the funnel, the original plan says to have a 3' entrance tapering to 2' with the opening 9'' off the ground. This didnt'nt seem to work so i made it shorter, about 3' off the ground and tapered it to 1'. It works better than before but some birds still manage to claw their way back up the funnel to a point where they can spread their wings and fly away. I was thinking to change the whole thing to a ladder type trap to see if it will work better. Not sure how many of you guys use these sort of traps but any advice will be welcome.