House wren
Sept 30, 2018, House wren, Rondeau Provincial Park, Ontario, Canada.
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.
source - https://www.allaboutbirds.org/guide/House_Wren/
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