but a young male who hasn't yet developed that head crest. 而是一只还没有长出羽冠的雄鸟

180. The sign of his adulthood.
     证明他已经成年
181. But he's made a mistake.
     但他弄错了
182. This is not a female
     这只不是雌鸟
183. but a young male who hasn't yet developed that head crest.
     而是一只还没有长出羽冠的雄鸟
184. And he's making off with the scarlet heart.
     他衔起红心飞走了
185. It's not easy finding sex in the city.
     在城里求偶着实不易
186. Raising a family in the city is not easy either.
     在城市里养活子女也不轻松

来自《行星地球 第二季 第六集 Planet Earth S02E06 城市》第 183 行