README file accompanying Clutch data.csv Clutch ID = ID number of the egg clutch the larvae originate from. Family = ID number of the mother of the larvae. Temperature = rearing temperature. Night temperature is 15 °C for each treatment. Plant = host plant the larvae were fed with. Pl = Plantago lanceolata, Vs = Veronica spicata. Group = unique ID for each group based on Family, Temperature and Plant. Day = time in days since the start of the experiment for that particular group (= molt to second instar). Mass = group mass in mg. N = amount of individuals weighed. Individual mass = average individual mass, obtained by dividing Mass by N.