I've had quite a few of these spotted towhees here lately, hunting in the garden and at the feeder. I don't remember seeing them before, but maybe I wasn't paying attention. I might have thought they were robins, because they're about the same size. I'm pretty sure they're spotted towhees. The link at the Cornell Lab of Ornithology says they're large sparrows, but these are quite a bit bigger than sparrows. I should hang the motion-activated camera up at the feeder again.