There are lots of pictures of this common, photogenic, eastern North American, soil-dwelling species of the carpenter ant genus at the guide, but perhaps none so far showing them drinking sap at a wound in the bark of a tree, in this case, a young bur oak. The picture was taken at night, and I did not see them in daylight at the same wound the next day, but they came back again that night. Nearby, I have noted them taking over the night shift in aphid tending on thistles, while the plants are dominated by Formica subsericea during the day.