Den entrance size
The long axis (28.59 ± 4.32 cm) of the oval-shaped entrances was significantly longer than the short axis (22.95 ± 3.57 cm) (F1, 129 = 3.24, P < 0.05). The average length of the long axis among entrances in flat areas (31.00 ± 4.27 cm) was significantly longer than that on sloped terrain (27.21 ± 3.71 cm) (F1, 129 = 3.37, P < 0.05). There was no significant difference in the length of the short axis of the entrance among different terrains (F2, 128 = 4.32,P = 0.082). In addition, there was no significant difference in the entrance area among the shady slopes (0.19 ± 0.03 m2), the sunny slopes (0.19 ± 0.04 m2), and the flat areas (0.22 ± 0.06 m2) (F2, 128 = 2.34, P = 0.073) (Fig. 3).