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Summary: Scientists retraced the steps of an expedition from 30 years ago to see how mountain birds are adapting to climate change.

Abstract: What do you do when it’s too hot? Do you sweat and stay where you are? Or do you go looking for somewhere more comfortable, like the shade under a tree? Climate change is making many places on Earth hotter. We wanted to know how birds in mountain forests are adapting to climate change. Are birds staying in the same parts of the forest? Or are they looking for cooler temperatures by moving higher up the mountain? We observed birds in old-growth forests in British Columbia, Canada. Then, we compared our findings to observations from 30 years ago. Most bird species today still live at the same range of elevations as they did before. On average, though, the elevation where birds are most common is getting higher. 

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