There were hundreds upon hundreds of these guys in a feeding frenzy just offshore at Sandy Hook yesterday. They must be staging for their migration southward. (There were few if any adults to be seen. Does anyone know if the juvies migrate later -- I know this is true of some species?) The dorsal view of this one shows a bit of gray in the scapulars, morphing from juvenile to 1st winter plumage, according to Sibley's drawings.
D500, Sigma 150-600 @ 600mm, ISO 2000, 1/2500s @ f/7.1 manual, HH. This is the landscape view at about 80%. I thought he needed some flying room. But I couldn't decide if I liked this one better, or a vertical as shown on the next pane.