Fig. 5.

Twenty-four-hour activity patterns of two captive echidnas (named “Shou” and “Dai”) in the same enclosure (609 h of 27 days) at a stable temperature (25 °C). a A snapshot of time-lapse photography from a wide-angle camera, positioned to enable filming of the entire enclosure of the two echidnas (Shou and Dai). b A behavioral example. Dai digs in the sand. c Box plots of the frequency of active time in comparison between the light and dark conditions and among individuals. There were no significant differences (Wilcoxon signed rank tests with Bonferroni correction, P > 0.05). Histograms of the 24-h activity pattern in (d) Shou and (e) Dai