My Speckled Sussex is 3 months old and I recently started to question it's gender. She has always looked like a pullet in build and color but I have noticed that she really stands up tall with her neck stretched when the older girls confront her and she always takes the lead when her little flock interacts with the birds from the original flock. (I have five 5 month old pullets and four 3 month old pullets who live side by side in seperate pens, but sometimes co-mingle.) A couple days ago I noticed the sussex perched on the ramp with her neck stretched and her mouth opened like she was trying to crow, but there was no sound. Yesterday I noticed that the feathers on her neck looked like they were moulting very heavily. (My EE did this when it got its beard and muffs) and I wondered if this meant the hackles were getting ready to come in. None of my older pullets did this and I wondered if this could be a sign that the sussex is a cockrel instead of a pullet?