Into the space came about 30 grackles, acorn dunking, sipping water, bathing, a swarm of black....
And then everyone vanished. Whoosh, gone! When the birds vanish like that there's only one reason. Hawk! A Cooper's hawk definitely on the hunt for lunch.
I couldn't follow this hunt, because there are fences up all over the park, Marathon fences. Big detours to get from one place to another. Things will get easier this week.