i have a tile table on the deck that i spread birdseed on everyday. he or she is probably looking for one of the many doves that feed there.
a couple of months ago there was a dove nesting in a dogwood tree beside the driveway. i would always say hello to her when i would come and go to my truck. one day i came home and she was gone and her feathers were all over the ground under the tree. i suspect this is the culprit.