I agree Finn and Mp, it's a young owl.
Remembering Mom being harassed by owls at N1 when she was brooding and couldn't fight back. And then there was the pair of GHOs shopping out N2 with Dad chasing them off at night and being knocked off the nest by a direct hit from the back. Always thought most of these incidents might have been owlet fledglings feeling their oats. They live together in close proximity and the owls breed earlier than the eagles and protect their "territory" and young just like eagles do.
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