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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
Only the adults have the speed and agility needed to make a catch.
只有成年水獭才具备捕鱼所需的速度和灵巧
Adults share their catches with their squabbling cubs.
成年水獭把“战利品”与幼崽一起分享，小家伙们立刻抢成一团
Most otters are solitary,
大部分水獭都是独自生活
but these rich, warm waters can support large family groups and even bigger predators.
但是这些富饶温暖的水域足以养活大型家族，甚至更大的掠食动物
Mugger crocodiles, four metres long, could easily take a single otter.
4米长的恒河鳄能轻松捕获一只落单的水獭
But confident in their gangs, the otters will actively harass these great reptiles.
不过集合起来的水獭颇有胆量，反而会主动骚扰这些大块头的爬行动物。
Team play wins the day.
群体作战通常会取得胜利
The Mara River, snaking across the plains of East Africa.
马拉河蜿蜒地穿过东非平原
As the land flattens out, rivers slow down and lose their destructive power.
由于地势平坦，河水流速变慢，没有了原来的破坏力。
Now they're carrying heavy loads of sediment that stains their waters brown.
河流中带着大量的泥沙，水变得很浑浊。
