Fawn is the meeting of recessive ruby eye and agouti creating a pretty orange rattie.
There is so many recessive traits flying through rats it's crazy.

I've had a few fawns in my breeding stock, none at the moment, but that's going to change, I have someone holding two female fawn girls for me, yay.
I also hope to re-introduce agouti to blue again, I loved my blue agouti rats I had before, blue with orange hairs, a pretty combo