Coulee Region Audubon Society Bird Quiz

You are walking down a trail, deep within an oak woods. Just as you pause to lean up against the trunk of a large White Oak, you catch a glimpse of a robin-shaped bird moving in the leaves on the forest floor. You raise your binoculars just in time to see that its back and the top of its head are rusty in color and there are large dark spots on its whitish breast. It flies off before you can get a better look. What was it you saw?