I believe that the white night furies have their color because they are a more artic species. As in a different color because of adaptions of camoflauge. If they were pitch black in the snow, don't you think it would be easier for hunters and other dragons to find them? They need that camo for them to hide in the snow.
Thats all I got for now. ._.
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Theories on albino Night Furies
RandomA description is useless for this, right? The name tells it all.