Not really. Subsequent studies show that the original experiment by Kettlewell was valid. I'm not an expert in this field but the scientific papers seem sound. <a href="http://rsbl.royalsocietypublishing.org/content/8/4/609" rel="nofollow">http://rsbl.royalsocietypublishing.org/content/8/4/609</a><p>In any case, the peppered moth example is only an illustration of the idea of natural selection.