Peter Forbes’ book was recently reviewed in Nature by Leena Lindstrom, who gave a nice plug for Heliconius genetics:
The genes for colour-pattern variation among Heliconius butterflies, for instance, are close to being fully sequenced. In the future, researchers may be able to transplant these colour genes to different species to study how the colour patterns change, and test how these new forms will be selected by predators. It should then be possible to witness the evolution of colour changes and mimicry in real time. Sounds like a neat experiment!