For smaller snakes either. For larger snakes/enclosures I like sliding doors as it's easier and safer to feed if you can distract the snake to one side of the enclosure, slide the door on the opposite side open, put the feeder in, and slide the door shut just enough that the tongs fit but the snake can't come out. With a drop door I've found the snakes like to come flying out over the top of the door once they realize the door is opening.
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