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.
One drawback of guillotine gates is that they do not allow additional pigs to enter once the trap has been triggered.
Rooter lifting gates require that a hog use its nose.
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.
Rooter lifting head gate on box trap.
Guillotine or sliding drop gates use a trip wire to trigger the door to fall.
The guillotine door raises up to create an opening into your trap and falls straight down when it s activated.