I have 8 barred rock hens, 9 months old, who run free in my back pasture during the day, with free access to their "coop" which is a horse stall, during the day. Morning and night I open and close their stall door to keep predators out at night. Weekends, when people are around, I get 7-8 eggs a day. Weekdays, when I get home from work, there are usually 6 eggs. I am thinking that something is coming in during the daylight hours and helping themselves to an egg or two, leaving no trace that I can see. Any ideas of where I should start in solving this mystery? Would a feral cat take eggs? Is it more likely a rat? Thanks for any help and ideas!