冬季新生幼仔夜晚也相对更活跃，与季节情感紊乱症患者相似，这意味着他们的生物钟也非设定在白天。
The winter pups were also more active at night, similar to patients with SAD, suggesting their clocks were not as well aligned to the time of day.
大象也会用它们的鼻子举起或是轻推大象幼仔跨过障碍物，用鼻子解救在泥泞中困住的同伴，或者举起脚边新生的小象。
Elephants also use their trunks to help lift or nudge an elephant calf over an obstacle, to rescue a fellow elephant stuck in mud, or to gently raise a newborn elephant to its feet.
一旦幼仔出生后不能生存,雌狮的最好方式,是摆脱掉它们，开始新生活。
These cubs are not going to survive once they are born so the female's best strategy is to get rid of them and start anew.
应用推荐