Common (lower right) and melanistic (top left) peppered moths rest on an unpolluted tree trunk

Common (lower right) and melanistic (top left) peppered moths rest on an unpolluted tree trunk. Judy Diamond and Alan B. Bond, Concealing Coloration in Animals, 38.

“Biston Betularia, or Peppered Moth.” Common (bottom right) and melanistic (top left) peppered moths rest on a tree trunk blackened with coal soot