I'm new to chickens, got 6 female chicks in early April. My barred rock started to lay a week or so ago. The others haven't. Although, the last egg I found was 2 days ago in the middle of the coop, rather than the nesting box, which makes me think that a new one has started laying. This morning, the girls are very agitated and noisy. Most have gone into the coop and are clucking away, one is outside pacing. I don't see any signs of preditors trying to get into their enclosed run. I do sometimes let them roam the yard, could it be they just want out? They've got water, feed, scratch. What could be the matter?