you can breed them together...but never saw one...

there are chocolate brown black rats...darker and lighter chocolate...

I had some ....George Miskimmons made a bunch...he bred a black he called copperhead to white sides...made a bunch of stuff...he made albinos that were yellow and oranges...called them sunrise and sunsets...brown snakes came out of these things a lot....

brown x brown = all brown...cool critters...the last one I had I gave to Nancy and Jack Witmer in Sunbury PA ...THICK male...really heavy and cool....

....good luck....try a pic if you can on here?...
-----
........JY