The female mandarin nests in a tree hole 雌鸳鸯在树上筑巢

140. And others can eat the leaf eaters.
     螳螂捕蝉,黄雀在后
141. It's spring in the great broad leaved forests of Eastern Europe and Asiatic Russia.
     这是跨越东欧-亚洲-俄罗斯的 世界上最大的落叶阔叶林的春天
142. The mandarin ducks are courting.
     鸳鸯正在示爱
143. The female mandarin nests in a tree hole
     雌鸳鸯在树上筑巢
144. and when it's time for everyone to leave she leads the way.
     她正在带着所有的宝宝们离开巢穴
145. The ducklings are only twenty four hours old.
     小鸳鸯才24个小时大
146. It's a long drop, and a few calls of encouragement are required.
     要让它们从这么高的地方落下 妈妈鼓励的叫声是必须的

来自《行星地球 第一季 第十集 Planet Earth S01E10 季节森林》第 143 行