Climate change driving tropical birds to higher elevations
There's much unwarranted debate about the reality of climate change, regarding whether or not the data is accurate, how much global warming is happening, whether or not it'll be serious, etc. When "cornered", such as when the Berkeley preliminary announcements came out, before the counter attacks were organized and mounted, some of the skeptics denied (ha) that they had denied global warming is actually happening, insisting instead that they are just disputing how much is happening, how it's happening, and how much eventually will happen in the future.
Part of that argument was completely disingenuous, because the entire point of casting uncertainty on the ground station weather data was to attribute a warming signal to something else, like increasing urbanization or the installation of a nearby air conditioner. And it was also disingenuous because all but the really marginal skeptics admit that the atmospheric data is showing warming too (though atmospheric warming scientist Roy Spencer blaims it on warmth manufactured by increasing cloud cover, or something silly like that).
Leaving that aside, one of the potent reminders that global warming is REAL and is HAPPENING is that the denizens of nature are responding to it. And this article is another example of that.
"Moving to the north doesn't help them, because tropical temperatures do not change very much with latitude. So moving up to higher elevations is the only way to go, but there are few historical data that can serve as baselines for comparison over time."