Chestnut-sided warbler.

May 10, 2018, Rondeau Provincial Park, Ontario, Canada.

Haven't seen a warbler yet but I'm sure there are a few species somewhere but there isn't anyone to see them.
Setophaga pensylvanica
The Chestnut-sided Warbler sings two basic songs: one is accented at the end (the pleased-to-meetcha song), and the other is not. Males sing the accented songs primarily to attract a female; once nesting is well underway they switch over to the unaccented songs, which are used mostly in territory defense and aggressive encounters with other males.
source - Cornell Lab of Ornithology.

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