Nashville Warbler in the snow

I was surprised to find this very late Nashville Warbler very actively foraging in our snowy yard this afternoon. I observed it for several hours as it hopped around the bases of our compost bins and bird feeders. While the temperature hovered around freezing through the day, it dipped to - 17°C a few nights ago.

[click on images to enlarge]

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Update: Last seen in our yard of November 25th.