My favorite bird is a chickadee. They are very small birds that have a black cap and bib against a white background with a tan belly. It is easily attracted to feeders. Is range includes the southeastern US plus southern Midwest.
I identified three birds based on their eating behavior a mourning dove, a cardinal, and a downy woodpecker. The downy woodpecker was not guessed by Merlin as the first bird because Merlin does not differentiate based on type of feeder (a suet cade vs a platform seed feeder).