Charles Darwin pointed to small changes like finch beak size and peppered moth color as visible evidence of an unguided evolutionary process at work.
How strong is the evidence for Darwinian evolution? What are the limits of the Darwinian mechanism?
At most, the story shows a change in the proportions of two varieties of the same species.
When the drought ended and the rains returned, however, food was plentiful, and the average beak size returned to normal.
Darwinians never had a rightful claim to them in the first place.