Huddling for Warmth!
The week brought sightings of at least two "Chimney Swift trees" in which thousands of swifts packed so tightly onto the sheltered side of tree trunks that the trunk is obscured. The birds did this to to thermoregulate: They were huddling for warmth!
Image: Sylvia Garcia-Smith
![Tree trunk covered with Chimney Swifts huddling for warmth.](https://s3.us-east-2.amazonaws.com/journeynorth.org/images/graphics/songbirds/chimney_swift_ tree_sylvia_garcia-smith.jpg)
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