You just make a big pen but put the trip trigger on the far side so as many as possible can enter before one trips it? Sounds good.
But I dunno if they'll stick around here long enough to get them used to feeding in the pen.
Haven't seen any for months and now this week, they're all over my place even in broad daylight. I guess they wander from one area to another in a big herd around here, and now it's my turn--but they may be gone next week. Tearin the heck out of the ground I have ryegrass on--and barely up. It rained about 2" here today, so I expect it's going to green up real good real soon (hope).