Fig. 6
Total activity time in terms of visitors’ effect (a–c: individual “Shou”; d–f: individual “Dai”). The studied Japanese zoo was closed on Mondays (a, d). In Japan, it was a weekday from Tuesday to Friday (low visitor numbers) (b, e), and weekends (Saturday and Sunday, high visitor numbers) (c, f). The activity times were statistically different among these three groups according to chi-squared tests (Shou: N = 4581, χ2 = 866.72, df = 14, P < 2.2E−16; Dai: N = 5810, χ2 = 663.23, df = 14, P < 2.2E.−16)