So my 12 week old Barred Rock looked very odd today; her feathers on one side of her neck were all fluffed up. We took a closer look this evening and she definitely has a huge lump on one side. Is it her crop? Are we in trouble? I have lost 2 chickens and I don't think I can lose one more--please tell me it's not serious! She is walking, eating, and drinking just fine. The other chicks seem fine. Help!