I have a hen that laid her first egg a week ago and her second egg yesterday. Everyday around 2:30 she'll wander away from the other chickens, walk across the back yard and go and sit on the nest for at least 30 minutes, sometimes more. She bobs her head around a little and moves some of the pine shavings, then she either lays her egg or gets up and rejoins the group. Why is she doing this? Does she think that 2:30 is when the eggs come out so she better be prepared in case today is an egg day?