The pictures of peppered moths on tree trunks in _some_ biology books were staged to _illustrate_ the _camouflage_ of the moths. This is not fraudulent, as the actual camouflage differences do occur, and are documented by field observer accounts, sketches, drawings and natural, non-staged photographs (the latter are not often available to text book writers). These textbook photographs are not evidence for natural selection in Peppered moths. The evidence for natural selection is from experiments in both the laboratory and the field, and extensive studies of natural populations in the wild. Decades of research and numerous independent studies show that the Peppered moth is an excellent example of natural selection. See this page for more details.
Reference: Majerus, M. "Melanism" 1998, Oxford University Press