No consumer remote wildlife cameras will, to my knowledge, record anything at 40 -50m, day or night. The camera has to be triggered, usually by IR movement, and it won't be at that distance. To have a look at what's available, search Amazon for 'trail camera' and you'll see a huge number. Buy two SD cards so that on your walks you can swap them over and bring the one just removed home to review without having to head back out to replace it, and check it at least every week.