That's a blue heron soaring over the water near the far shore.
Chipmunks don't hold still very long, or very often.
As I came around a bend near the island, there was a flurry just a few feet away-- and this redtailed hawk flew up from the grass, and across to the island, carrying a squirrel in his talons. He lost his grip on the squirrel; you can see it in the water beneath him.
Moving to a perch a bit further away from me.