Bruce, I would surmise that ML's tilapia demise pretty well coincides with the fall water turkey season. Without a plentiful supply of dying tilapia, they would probably pass him by. Then, I figure they wait until his spring tilapia planting to head North. The scout birds signal the rest and they stopover and get enough protien to make it North for the summer. They probably have their own forum set up to talk about their space cadet benefactor in Texas.