| into the night: camera traps reveal nocturnal activity in a presumptive diurnal primate, rhinopithecus brelichi. | most living primates exhibit a daytime or nighttime activity pattern. strict diurnality is thought to be the rule among anthropoids except for owl monkeys. here we report the diel activity pattern of an asian colobine, the guizhou snub-nosed monkey rhinopithecus brelichi, based on a methodology that relied on using 24-h continuously operating camera traps. we conducted the study in fanjingshan national nature reserve in guizhou, china from march 22 to may 19 and from june 17 to october 14, 2011. ... | 2013 | 22843040 |