Fig. 7. Behavioural responses of brush-turkey chicks to the first 10 stimulus events in choice tests that included a pecking robot. Each stimulus event consisted of 10 robot pecking movements. Behaviours represent the initial response evoked. Numbers in parentheses show sample size (N chicks) per stimulus event – sample sizes vary because some chicks only spent a short time in a choice arm containing the pecking robot and experienced only few stimulus events. See Methods for detailed descriptions of behavioural categories.