That's why they call it a yellow-rumped warbler.

Yellow-rumped warbler.
Rondeau Provincial Park, Ontario, Canada, Oct 12, 2021.


We had an influx of at least 12 in or around the pond at one time.
This one was displaying the yellow rump which is often hidden on a perched bird.
They also have yellow on the crown and the sides.
Setophaga coronata
The Yellow-rumped Warbler is the only warbler able to digest the waxes found in bayberries and wax myrtles. Its ability to use these fruits allows it to winter farther north than other warblers, sometimes as far north as Newfoundland.
source- Cornell Lab of Ornithology.

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