一项开创性的无人机调查揭示了新西兰濒危直冠企鹅命运的惊人分化。一个种群几十年来一直保持稳定，而另一个种群的数量却下降了40%以上。A groundbreaking drone survey has revealed a startling split in the fate of New Zealand's endangered Erect-crested penguins. While one population has remained stable for decades, another has declined by more than 40%, ap