Summary of GAMMs relating (a) the probability of male little bustard snort-call display behaviour to smoothed fixed effects of hour of the day (time, 5:00–21:00 hours), mean hourly temperature and Julian date; (b) proportion of snort-call display behaviour each day, to smoothed fixed effect of daily average daytime temperature (5:00–21:00 hours) and Julian date.

Both models incorporate random effect of bird identity. 17 little bustards were tagged with accelerometers during the display seasons (April and May) of 2014 and 2015 at five sites in Extremadura (Western Spain) and Alentejo (Eastern Portugal). In model (a) predictive error is represented by the average ± standard deviation of the error rates of 10 cross-validation models, while in model (b) we used the average ± standard deviation of the Normalized Root Mean Square Errors. edf denotes estimated degrees of freedom. In both models, display behaviour was classified from seven-second accelerometer sequences.