Our black rats are very difficult to photograph. They can be quite shy, and scurry off quickly if you make any sudden moves or get too close to them, unless they are in their feeding area or over head run... but either of these areas are not that great for taking pictures.
I did go in to the enclosure with them one morning for a few minutes, and after they got used to me being in there I did get a chance to take a few photos, but it was VERY dark. I was quite pleased with these ones though.
Thanks for looking :-)