I think this is a baby Grackle, guessing by the adult birds which seemed most upset by my paying attention to the little guy. He was in the grassy area next to a parking lot in a large park, and the mowers were on the way, so ... I interfered with nature taking its course. He protested and was able to achieve about an inch up in the air before flopping back down, so I'm guessing he was within a day or two of being fully fledged. Hoping, anyway. I didn't want to move him too far since when I first got there he had a lizard tail hanging out of his mouth, so some adult bird had most likely been bringing him food. I moved him to a little flat spot in a nearby tree made by the growth of a large branch. I know he was safe from the mower there and hoped he could avoid most predators and still be found by his birdie benefactor.