这些幼畜的成活率很底。

The survival rate of these baby animals is very low.

麋鹿幼畜对捕猎的灰熊只有一种防卫措施。它们玩藏猫猫的游戏。但对幼畜来说，这是生死关头。

Elk calves have only one defense against the hunting grizzly. They play a game of hide-and-seek. But for the calf, it's life or death.

鼬鼠是一种胆小的动物，但在保护其幼畜时也会凶猛地搏斗。

The weasel is a timid animal but will fight like a tiger in defence of its young.

这个试验中的48条拉布拉多猎狗幼畜是从断奶的7窝里选取的。

This experiment involved taking 48 Labrador pups from seven litters just after they were weaned.