I tihnk you have it about right, but its probably for something bigger
than a mouse or rat. But I think the bait is hung off of the wire, and
probably there is some sort of cover that seals the bait in. The prey
goes in the entrance at the bottom and climbs the tunnel, smelling the
bait but unable to get at it, and at the top it squeezes out on top of
the bucket, and the top tilts and it falls it. It might be a live trap
rather than a drowning trap. The prey has to be quite large; a mouse
or rat could easily get through the holes in the perforated
tunnel....maybe its for squirrels or muskrats?
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