昼行性动物：此类动物适应于在白天的强光下活动，如灵长类、有蹄类和蝴蝶、禽类等，称为昼行性动物；动物适应于在夜晚、早晨或黄昏的弱光下行动，如家鼠、蝙蝠和蛾类，为夜行性动物；另一些介于其中，如田鼠。昼行性动物（夜行性动物）只有当光照强度上升到一定水平（下降到一定水平）时，才开始一天的活动。
有一群动物（包括了人类与其他现存旧世界的灵长类祖先）变成了昼行性动物，散布到森林里头，并将果实纳为重要的食物。
One group—among which were the progenitors of humans and the other Old World primates living today—took up a diurnal life, spread out into the trees, and made fruit an important part of their diet.
绿刺蜥和其它大多数物种一样，是昼行性(在白天活动)冷血动物，因此，它们不能调整自身体温。
Sceloporus lizards, like most others, are diurnal - active during the day - and cold-blooded, so they can't regulate their body temperature.
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