How do pigs enter the Pig Brig Trap System? The trap is the technology that takes advantage of feral pigs’ natural behavior. The pigs root under the netting, seeking out the bait. They seem to perceive the net as if it were vegetation. The pigs aren’t leery of it and don’t realize they’ve been trapped until you show up (or they sit longer in daylight). If they see other pigs in the trap feeding, they keep pushing in. The pigs walk into the trap, can’t walk out, and wait for you to return wheneve