Top Scientific Problems with Evolution: Natural Selection
Artificial Selection, Bernard Kettlewell, biology, Charles Darwin, Darwin's Finches, Evolution, Galápagos Islands, Hugo de Vries, industrial melanism, Life Sciences, Macroevolution, Microevolution, mutations, natural selection, On the Origin of Species, peppered moths, Peter and Rosemary Grant, Theodosius Dobzhansky
When the drought ended and the rains returned, however, food was plentiful, and the average beak size returned to normal. Source