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SE PA. 5 in the air. one was considerably lower and looked to be a very light underneath red tailed (the first two pictures). The high circling birds were darker and had very prominent pale/translucent rectangular block on the primaries, which is not something I am familiar with.  They would spiral dive as a group.








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Sibley, 2nd ed., top left of page 138

Juvs of all of the buteo species that breed widely in the ABA Area have translucent wing panels, while only Red-shouldered and Ferruginous have them also as adults.

Given that it's late spring as far as Red-tailed migration goes in your neck of the woods, virtually all of the Red-taileds still migrating are juveniles.

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