House wren,
It was flitting through the hedge above the pond then moved out into the open.
Troglodytes aedon
A House Wren weighs about as much as two quarters, but it’s a fierce competitor for nest holes. Wrens will harass and peck at much larger birds, sometimes dragging eggs and young out of a nest site they want – even occasionally killing adult birds. In some areas they are the main source of nest failure for bluebirds, Tree Swallows, Prothonotary Warblers, and chickadees.
source - Cornell Lab of Ornithology.
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