From Creatures Wikia
Redbull Norns are a genetic breed based on the Wingies and have slightly shorter life
spans which decrease the more they breed. Also when they breed they gain Muscle
Tissue. They also get lonely very quickly. Which means they like to stay in
groups. Lastly their pregnancy is VERY short. Also it's pigment genes tend to
mutate quickly, even in a second generation creature. There is also some other
minor changes for easier care.
They require Wingies in Norn slot R.
Read more about their story here.