When I had a week of rampant mole-happenings in my garden (literally 16 mole hills appeared in a small patch within the space of a week), I considered the use of a camera that could possibly capture the hills appearing.
Tasker Dunham has shown what he has spotted with his and I was able to get hold of the same sort of camera. Here is what mine recorded on the first night (once I’d got it set up right):
Not yet any moles; there are a couple of hills within the field of view that I hear being revisited some nights while I am in my tent nearby. Also up until a month or so ago I would hear a resident hedgehog doing its rounds, so there is hope of capturing that, or perhaps a rat.