Got really close to a pied billed grebe today.
Hard to pick one photo out of 83 to post.
Not certain but I think this is a non breeding adult.
Pied-billed Grebes can trap water in their feathers, giving them great control over their buoyancy. They can sink deeply or stay just at or below the surface, exposing as much or as little of the body as they wish. The water-trapping ability may also aid in the pursuit of prey by reducing drag in turbulent water.