Wilson's warbler.
Oct 4, 2018, Wilson's Warbler, Rondeau Provincial Park, Ontario, Canada.
A fall migrant at our small water feature.
Looks like he is wearing a bad toupee.
Cardellina pusilla
The majority of Wilson’s Warblers nest on the ground, except for populations in coastal California and Oregon where they nest up to 5 feet off the ground. These birds also tend to lay fewer eggs per nest compared to their ground-nesting relatives.
source - https://www.allaboutbirds.org/guide/Wilsons_Warbler/
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