My sweet Maple Leaf came from the animal shelter pre-trained on how to cry for food and what sounds to cry at. He was a month or two old back then. It's been 2 months and now everyone is constantly begging for food, crying at sounds that are similar to pellets (dog food hitting a bowl, the sound of the dog food container opening, ANY plastic bag making noise), or crying when I come home and they hear the back door open. When one pig cries, the others start to cry. It's very cute but it's hard when every couple of hours, someone is throwing a fit for no good reason. I thought I'd gotten used to this, but Maple Leaf has changed everything. It's funny how these guys pick up these behaviors, especially the boys who live in a separate cage.