Climate Lab is a Seattle Times initiative that explores the effects of climate change in the Pacific Northwest and beyond. The project is funded in part by The Bullitt Foundation, CO2 Foundation, Jim and Birte Falconer, Mike and Becky Hughes, Henry M. Jackson Foundation, Martin-Fabert Foundation, Craig McKibben and Sarah Merner, University of Washington and Walker Family Foundation, and its fiscal sponsor is the Seattle Foundation.

It’s beautiful, ethereal: When we hear the sound of the Swainson’s thrush in the Pacific Northwest’s woods, we know our summer is truly here. Our bird is back, with its signature song gracing our long, summer twilights.

And yet, this is not really “our” bird at all. It is a bird of two worlds. Arriving here by late May for its mating season, the Swainson’s thr

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