Sick Bird: A very rounded goldfinch.

I noticed this goldfinch both at the feeder and on the ground. There is no other goldfinch that looked like this even when they were puffed up against the cold. I also observed this bird always feeding alone, no other birds around at the same time. I also noticed that it would be at the feeder much earlier in the morning than the other birds and later in the evening when other birds have stopped. It seemed a bit curious to me and thought I would submit it to Cornell.