Photos in the dark

For the past several nights I've been trying to catch a photo of the animal that's been making a path in the grass from the water to a tree in my yard.  I'm using one of those cameras that hunters use to get an idea of what's around their blind.  So far I haven't been very successful in getting a shot of what I expect is a muskrat.  Instead I've captured several images of raccoons during the night and squirrels during the day.  But I'll keep trying and report back.