We have two 6-7 week Australorp hens...but we're beginning to suspect that one of them is actually a rooster. She isn't aggressive, but does have a deeper voice than the other. What really has us wondering is her tail feathers. They stick up rather than laying down like the others hens. Also, her comb has been developing longer than the other. Of course, its possible they could be slightly different ages (we got them from a local feed store). Any suggestion would be great! The one in front is the one in question. Thank you!