Host plant nutrition, butterfly life history and morphological data from wild-collected butterflies. Each row represents an individual. Genitalia area was measured in mm^2, and wing length in cm. Wing length was log transformed for analysis. Nutrition data measured in % dry mass, calculated as described in the manuscript. This data is needed for the example code to work. Example code is located at: with filename "PGLS analyses for egg number and nitrogen females.R"