Pair of Virginia Rails
In the past I have found rails in ponds/wetlands with heavy amounts of cattails. As seen in these brief video clips, the Virginia Rail effortlessly walks into and out of the cattails providing 'now you see it, now you don't' action. VirginiaRail-a2 from SeEtta Moss on Vimeo.
National Audubon website says, ".... the long-billed Virginia Rail eats mostly insects."