PLANET EARTH From Pole to Pole
At the peak of the dry season（旱季） in the Kalahari water arrives in the Okavango. It fell as rain a thousand miles away in the highlands of Angola（安哥拉高地） and has taken nearly five months to reach here. The water drives out insects from the parched ground, which are snapped up by plovers. Catfish（鲶鱼）, travelling with the flood, collect any drowning creatures the birds have missed.
It's a seasonal feast for animals of all kinds. Birds are the first to arrive in any numbers - water cranes（纠正一下，这里第一遍听写出来的是watercrane，查阅了相关资料后，发现和原视频的对应不上，后面check以后发现正确的单词应该是wattled cranes肉垂鹤或垂耳鹤）, then black storks（黑鹳）. Behind the birds come buffalo. After weeks of marching their trek is coming to an end. As the water sweeps into the Okavango a vast area of the Kalahari is transformed into a fertile paradise.
