Last week, i found the nestbox door open. Only opposable thumbs could have opened the latch. I thought it was my brother forgetting to latch the door after he closed it. Next, eggs started disappearing from the nestbox. This happened only when we were gone. This morning, i found that not only were my chickens out of the run, but the side gate, which opens into the street, was also open. I had closed my chickens in their coop last night, and only a person could have opened the gate and the run. I am so glad my chickens didnt wander into the street and get hit. How can i stop the person!