While there are some individual differences in the circadian rhythm, where some individuals are more nocturnal than others, humans are basically a diurnal (day-living) species.
虽然在昼夜节律中，人与人具有个体差异，但人类基本上都是在白天活动的。
2
The behavioral activity of Oriental white stork at different stages of breeding season had definite rhythm, and the diurnalrhythm differed obviously.