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Botos are highly social, and in the breeding season, there is stiff competition for mates.
亞馬遜江豚是高度社會型動物。在繁殖季節，會有一場激烈的求偶競賽
The males hold court in a unique way.
雄江豚會以獨特的方式向雌江豚示愛
They pick up rocks in their jaws and flaunt them to their attending females.
它們用長嘴撿起石塊，然后向自己的“心上人”炫耀。
Maybe each male is trying to show how strong and dexterous he is
這或許是雄江豚展示自己強壯身體和敏捷身手的一種方式
and that he therefore is the best father a female could have for her young.
以此來證明自己將是最好的父親，雌江豚為了孩子就應該選它
Successful displays lead to mating.
求愛成功后，它們便開始交配
Even for giant rivers like the Amazon,
即使像亞馬遜河這般巨大的江河
the journey to the sea is not always smooth or uninterrupted.
流向大海的過程也并非都是平緩連續的
Iguagu Falls, on the border of Brazil and Argentina,
位于巴西和阿根廷邊境的伊瓜蘇瀑布
is one of the widest waterfalls in the world, 1.5 miles across.
是世界上最寬的瀑布之一，寬幅達1.5英里。
In flood, 30 million litres of water spill over every second.
瀑布每秒的水流量達到3000萬立方米。
