I’ve just started playing with one of those ‘trail cams’ or ‘camera traps’. You attach it to a tree or similar and it captures movement using an infrared camera sensor, and illuminates the scene with a number of IR LEDs on the front. These cameras are not particularly expensive, and I think it’ll be quite fun.
My first attempt in the wood next to our driveway didn’t quite have my subject facing in the direction I’d hoped! I also spotted several rabbits and a muntjac, but mostly I got clues as to where I should put the camera next to capture more of the nocturnal social life. Coming soon, I hope…