Agreed, I was kind of sad to notice this when I started breeding my R-Snow Owls, as I was looking forward to creating some good color combos. Obviously I can just as easily get good combos with the regular owl, but I like the design of the R-Owl better.

Please dev, if you happen to read this, please add the X- and R- variants in! It may not be as exciting an update as adding whole new compatible fliers, but it would be insanely appreciated!