What gives... 7 hens, no eggs since August. Three are 2-3 years old, the others are just under a year. They have been living together the whole time, no signs of a stressful social pecking order. They have been wormed twice in that time (no evidence of an infestation). No sign of mites. They have continuous access to 22% layer and oyster shells and clean water. The three older ones molted in October- November. All feather coats look healthy. No evidence of predators/ neighbor pet agitation, they are in a very secure coop/ run. What else could be keeping them (even just 1) from laying?????