Trailcam hasn’t picked up any Virginia Range mustangs last few weeks, so I put out two stock tanks and filled them with water on 08/10/18. They found them that evening!
The idea is to keep the horses up in the hills and away from populated areas.
Bait traps use the same concept. Put out some food and water but enclose the area with a pipe panel fence and attach the gate to a trip wire. See the video at this post.