The youngest eggs are the most vulnerable, 刚产下的卵是最脆弱的

227. This wasp is a specialist hunter of frogs' eggs.
     这只黄蜂是捕食蛙卵的专家
228. It's noticed the wriggling tadpoles at the bottom of the leaf.
     它在叶子底部发现了正在蠕动的小蝌蚪们
229. He mustn't move.
     他决不能移动
230. The youngest eggs are the most vulnerable,
     刚产下的卵是最脆弱的
231. and he can't guard them all.
     他无法同时保护所有的卵
232. But these tadpoles are not as helpless as they might appear.
     但这些小蝌蚪并不像表面看起来那样无助
233. Incredibly, the unhatched tadpoles can sense danger,
     难以置信的是 未孵化的蝌蚪能感应到危险

来自《行星地球 第二季 第三集 Planet Earth S02E03 丛林》第 230 行