Wilson's warbler, Rondeau Provincial Park, Sept 29, 2018.

Another yard/pond visitor.
His black cap looks like it is quilted.

Cardellina pusilla
Naturalist Alexander Wilson, often called the "father of American ornithology," described the Wilson’s Warbler in 1811 which he called the “green black-capt flycatcher.”
source - https://www.allaboutbirds.org/guide/Wilsons_Warbler/

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