Cardinals will do this as a courtship ritual, feed each other seeds. I thought it was past the time for courtship for cardinals, but perhaps they are on a little honeymoon.
I wish the lighting had been a little different on this. There is a little sunlight on the cardinals, but because my neighbor’s steps are in full sun the birds were nearly silhouetted. A flash was not an option because I shot this through my front window and would have had only a flashed out window. But I’m so glad I finally caught them in the act—I’ve seen cardinals do this for years in the spring but haven’t been able to catch them in time.