Broods differ significantly in the species used for nectaring , likely due to differences in their phenology .
Karner blue butterflies have been reported feeding on the nectar of 41 different species in a single study in west - central Wisconsin .
Broods differ significantly in the species used for nectaring , likely due to differences in butterflies ' phenology .
Karner blue butterflies have been reported feeding on the nectar of 41 different species in a single study in west - central Wisconsin .