I have 14 hens that just started to lay eggs. I am new to chickens. I chose to start with just pullets. My ladies seem perfectly happy without a man around--But Lately they "posture" when I pet them- squatting- tails up, heads down, wings partially spread, holding perfectly still. They seem to be "assuming the position". Is this just "hen puberty" and will pass or do they want a Roo?