Elephants, giraffes and large primates (such as humans) require relatively little sleep; rats, cats, voles and other small animals spend most of their time sleeping.
Elephants, giraffes and large primates (such as humans) require relatively little sleep; rats, cats, voles and other small animals spend most of their time sleeping.
大象、长颈鹿以及大型灵长类（像是人类）需要比较少的睡眠；而大鼠、猫、田鼠及其他小型动物，会花比较多的时间睡觉。