It typically takes up to three generations of butterflies to make the complete journey. This means that the navigation information is genetically programmed.
Advances in live data logging show how birds do it: get from here to there. Some surprises were uncovered in recent experiments.
The media are generous with claims that new findings “shed light” on evolution.
He concludes that “evolutionary ‘just so’ stories” are examples of “wishful thinking starved of molecular details.”
They reason backwards: Birds evolved, therefore some poorly understood mindless processes must have driven them to evolve.