Guillotine or drop style doors are called single catch doors because once the trap has sprung that is the door has closed no more animals can enter the trap until it is manually reset.
Guillotine trap door trigger.
Rooter lifting head gate on box trap.
The guillotine door raises up to create an opening into your trap and falls straight down when it s activated.
Photo courtesy of texas agrilife extension.
Therefore it is extremely important that the trap be strategically baited to insure that most if not all of the pigs in a sounder have entered the trap.
This is not a continuous trapping door once it s closed it s closed until you come and manually open it or reset it.
I personally prefer the guillotine door as it generally has a bigger opening and it is positively closed with an active latch to prevent pigs from rooting.