Just like the moths in europe that were in my old textbooks. The moths got darker as the pollution/soot got on the trees and made the trees darker. And now that the pollution problems (from the 50's and 60's), the trees are lighter and the moths are getting lighter.
Actually the moths themselves have always been the same color. Its just the NUMBER of moths of "each" color that had changed. Just like these birds.
That's called a change in the allele frequency. In other words, evolution.
Altruism?
This was a fake study. The moths were pinned on the trees for the photos taken and did NOT rest on either light or dark areas per se. Just another fake evolution theory that was totally rigged, and this is a fact you can check if you want to. Most evos know it was fake by now and like to sweep it under the rug, it is embarassing for them to mention it.
Yet both are evidence that evolution takes place.
At the same time, it seems entirely unwieldy and unreasonable to posit that ad hoc divine intervention or intelligent design is the decisive factor.
There are other possibilities but the exalted priesthood of Darwin, preaching its atheism-based faith claims ex cathedra from the public schools and court rooms of this nation, has effectively hijacked the power of the state to stifle honest inquiry and science.
Thus, the study of life on this planet remains mired in late 19th Century thinking of a mechanistic clockwork nature.
Someday biological sciences will have to honestly seek to understand the role of intelligence (especially the most neglected component: the context of the observer/interpreter) and make space for information theory in the paradigm of evolution. Great 20th Century minds, including those of Schroedinger and Shannon, have defined a path of inquiry that Darwinists refuse to walk for fear of losing their religion and the power to force it on the rest of us.
You are exactly correct. The birds didn't change, just the observations.