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This 2017 photo provided by Graham Montgomery shows a russet-crowned warbler in the Cerro de Pantiacolla mountain in Peru. The high-elevation tropical species lives only near the top of the mountain (above 1350 meters). Between 1985 and 2017, biologists estimate a 72% decline in population on this mountain, as climate change shrinks habitat for ridgetop birds. A new study on mountaintop extinctions was published Monday, Oct. 29, 2018, in the Proceedings of the National Academy of Sciences. (Graham Montgomery via AP)

This 2017 photo provided by Graham Montgomery shows a russet-crowned warbler in the Cerro de Pantiacolla mountain in Peru. The high-elevation tropical species lives only near the top of the mountain (above 1350 meters). Between 1985 and 2017, biologists estimate a 72% decline in population on this mountain, as climate change shrinks habitat for ridgetop birds. A new study on mountaintop extinctions was published Monday, Oct. 29, 2018, in the Proceedings of the National Academy of Sciences. (Graham Montgomery via AP)

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