We have six bantam cochins. One always had hiccups and just went broody. I picked the chicken up and it had a large lump between its neck and chest on the right side. Initially I thought it was a tumor or something, but after feeling around on it I notice it was grain and bird seed so I am thinking it has a hole in its esophagus and the food is falling out in between its skin and body cavity. The weird thing is that the bird walks around and acts completely normal. Its now broody, but I believe its also time to go. Poor bird.