Black Vulture nest with 1st of 2 eggs

The nest site was on the ground within a hollow at the base of a large (living) red oak tree. This oak was located in deep mature woods at the edge of a sharp drop/cliff along a small river. The ‘nest’ contained no nesting material. This photo,taken on April 15, 2015, shows the first of two eggs (approximately 3.5-4 inches long; note the size of oak leaves in the photo). I carefully revisited the nest on June 29, 2015 and there were two chicken-sized black vulture chicks with dirty white down feathers. I could smell the stench of the nest site about 75 feet away from the nest. The adults were not present during either visit.