It appears to be two round objects, deep purple. I recalled two years ago watching a female Wood Duck nearby as it climbed around in wild grape vines and ate the grapes. There are wild grapes on the vines along the road to May's Point today. So, I looked further into the sequence of images.
Again there appear to be two round berries, and the second one, on close examination, has a blossom bump (for lack of the proper botanical term).
Let's look at the third image.
I've got plenty more images, and they all lead me to conclude they are feeding wild grapes to their chicks along with insects. On my first visit there, I saw one of the adults collecting berries from the nightshade vines at the base of one of the dead trees. That confirms that fruit are part of the feed. Had not thought fruit would be in the mix.
There is always something new to discover in the natural world, especially when you stay in one place and let the action unfold.