作为世界上最高的哺乳动物,长颈鹿所需的睡眠时间却是最短的,它们平均一天的睡眠时间仅为半小时。因为,对它们来说,保持时刻的警觉“是最重要的。特别是野生长颈鹿,通常打一次盹也只有几分钟。即使这样,长颈鹿在多数情况下,仍然会选择蜷成一团睡觉。看看这只长颈鹿的睡姿,你会替它的脖子感到难受吗? As the world’s tallest mammal, giraffes require the least amount of sleep, with an average of only half an hour of sleep a day. Because, for them, to maintain the moment of alert ”is the most important, especially wild giraffe, usually a nap only a few minutes, even in this case, in most cases, giraffes will still choose to curl up to sleep. Look at this giraffe’s sleeping position, you will feel it for the neck it?