Complete genome of Eastern Tiger Swallowtail (Pgl) specimen shown on top left reveals expansion of isoprenoid biosynthesis enzymes (highlighted yellow portion of the tree shown on top in the middle), offering a possible explanation to synthesis of odorant terpenes in the orange fork (osmeterium) of its caterpillar (top right) used to deter predators. Circadian clock system (bottom) rich is species-specific mutations could explain differences in pupal diapause between Pgl and its sister species Canadian Tiger Swallowtail Papilio canadensis.