He then explained this more fully:
"The decided wing-covering of food is a well-known hawk behavior. It's called "mantling," to spread the wings out over the food, bend over, and conceal the food from the direct vision of other hawks (and humans).
(This image is not of one of the Franklin hawks)
(Note from Della - I added this link to give you an idea of what the hawks sound like when we refer to that seagull-like calling:
The eyasses will soon be much more quiet and concentrate on hunting, not making a verbal racket. The parents will become less visible, preferring to stay in the distant background, forcing the eyasses to learn to live without any hope of parental rescue or interaction.