动物会丢弃最弱小的幼仔。Animals reject the runt of the litter.最弱小的幼崽the runt of the litter要是被逼急了,甚至最弱小的动物也会回咬一口.Even the weakest animal will bite back when it is cornered....

“弱小的”的英语可以翻译为：puny ...