I've used Backyard Chicken for a long time for research, but this is one question I simply cannot find the answer to. We ordered 15 Brown egg layers from Murray McMurray. We think we've identified most of those who survived (a fun game indeed) but two we're not sure about. They're the right color for white rocks, but they're growing extremely fast. They must be double the size of the other Rocks in the group and they're supposed to be the same age. Is it possible we accidentally received some meat birds instead, or do White Rocks grow faster than Partridge/Buff Rocks?