Our Neighbors: Rufous-Bellied Eagles!
I saw not one, but two of these last week. The first was soaring above the trees, then suddenly dive-bombed something in mid-air (maybe a bird, but I didn’t see anything in its claws afterwards), then rose high up again and flapped away. Then its friend flapped out from behind a tree, and IT dive-bombed some imaginary thing in mid-air, and rose up to its previous height. Then both of them flapped off to the north, in tandem.
Their shape changes entirely when they dive, from the nearly flat-winged horizontal bar they resemble when flapping, to sharp-shouldered Ws zipping earthwards. I see where the designers of the Stealth bomber got their inspiration.