Thanks everyone.
Ann: That is so cool that the Wrens are building a nest in the flower pot right next to the door. I wonder if they will continue the process and raise a brood since it's so close to the house and especially if your dog goes out there a lot. It should be fun to watch the progress of the nest building and of course any babies! The little ones are so cute. I left two of those purple martin condo type birdhouses in different parts of the backyard at our other house and the Carolina Wrens always built at least two nests in each condo but there would only be eggs in one of the two. I've seen wrens around here on occasion but no nests.
Oh and before I forget, I think your photo of that huge, beautiful oak with the pair of hawks is wonderful! I bet they are nesting nearby, possibly in that very tree.