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i can't believe it never occurred to me to put a cam outside the pen.  i do have a second cam, that wasn't working real well.  But putting it outside is a great idea.
i actually saw the tracks this morning in the pen, close up to where the camera was mounted.  With over 200 pictures on the cam, i figured i would see what was making them.  What i did see was that rat, but on the other side of the pen, not running in the area where the tracks were made.  Now i'm really baffled.  Maybe i can mount one cam on the outside of the pen pointing in and the other inside pointing across the pen.  Weather is nice and warm like the last time these tracks appeared, which was approximately last month.  
Hopefully i'm close to an answer.  Then SilkieChickenLover336, you need to take over.  Bears and coyotes are far more interesting than one lone rat.