Chestnut sided warbler

Rondeau Provincial Park, Sept 21, 2022.


One of the fall warblers migrating south through our yard.
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. Some males sing only unaccented songs, and they are less successful at securing mates than males that sing both songs.
source - allaboutbirds.

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