Data from Binns et al. 2022, Ecology and Evolution "Additive genetic variation, but not temperature, influences warning signal expression in Amata nigriceps moths (Lepidoptera: Arctiinae)" The first datasheet contains data from wild-caught Amata nigriceps moths collected between years 2017 and 2020. This includes collection site and date, and individuals' sex, wing length and "p_spot" values (proportion of orange in the wings, quantified from photographs). This dataset was used to analyse seasonal differences in warning signal expression in the wild population. The number of wing spots (wing_spot) and the proportion of orange in the forewing (p_spot_fw) were measured only from a subset of individuals, and these columns therefore contain missing values. The second datasheet contains data from the rearing experiment where Amata nigriceps moths were reared in the laboratory in different temperatures (20, 24 or 28C). The datasheet includes individual data, including pupation date, length of the larval period, pupal weight, eclosion date, time from pupa to eclosion and eclosion success, as well as wing length and "p_spot" values (proportion of orange in the wing). This data was used to analyse the effect of rearing temperature on life-history traits and warning signal expression. The dataset contains missing values because i) some pupae did not eclose and measures from an adult moth could not be recorded (column eclosure_success = no), ii) some moths were badly angled during pinning or their wings were deformed and the photographs could not be used for wing length and p_spot measures (column photo_usable = no). In addition, sire_id, sire_p_spot and sire_wing_length columns contain missing values when we only caught the female that laid eggs and the sire was unknown. The third datasheet contains records of larval survival in the rearing experiment. This includes id number, family, population and temperature treatment of the larvae, and their "status". Column "Status" includes values 1 and 2: 1 = larva is alive (pupated larvae are righ-censored, e.g. not included in the data after pupation) 2 = larva is dead This data was used to analyse the effect of rearing temperature on larval survival. The fourth datasheet contains data to create a figure of larval survival (Fig. 3 in the published article). This includes percentage of larvae that were alive in each population and temperature, recorded once a week (column "Survival_cumulative). The R script for the analyses is included with the datafiles.