There are 850 different cichlids alone, 这里有850多种不同的慈鲷
From memory, the wildebeest are coming 鳄鱼凭着记忆得知 角马已经来了
the rivers are not only a vital source of drinking water, 河流不仅是唯一能解渴的重要水源
Now they are carrying heavy loads of sediment 河流中带着大量的泥沙
Lines of wildebeest are on their march. 一队队的角马正在迁徙途中
Fishing practice begins when the cubs are four months old. 小水獭在4个月大时就开始学习捕鱼
Indian rivers are home to the world's most social otter - 印度河里住着世界上最具社会性的水獭
Up here, there are fewer predators to eat their eggs and fry. 只因上游很少有捕食鱼卵 和鱼苗的掠食者