Mountain birds on “escalator to extinction” as planet warms

WASHINGTON (AP) — Scientists have been able to prove how mountain-dwelling birds are pushed to ever higher elevations by a changing climate, what scientists call “an elevator to extinction.”
A meticulous re-creation of a three decade-old study of birds on a mountainside in Peru gave biologists a rare chance to study how the birds’ habitats changed between 1985 and 2017.
In that time, the average temperature on the mountain climbed three-quarters of a degree Fahrenheit, pu