Event behavioral performance distribution of adult and juvenile captive giant pandas in different locations. a, b, c, d: Different superscripts indicate significant differences in expressing event behaviors of adult giant pandas between different locations (p<0.01). X, Y, Z: Different superscripts indicate significant differences in expressing event behaviours of juvenile giant pandas between different locations (p<0.01). α, β, γ, δ, ε: Different superscripts indicate significant differences in expressing event behaviors of juvenile giant pandas between different locations (p<0.01). The data are presented as the mean ± SEM; * p<0.05; ** p<0.01.