A mating ball of anacondas.

求偶的水蟒团成一个球。

How did anacondas get so big?

水蟒是怎样变得如此巨大的呢？

The largest snakes in the world, anacondas can grow to 550 pounds (227 kilograms).

绿森蚺是世界上最大的蛇，可以长到550磅(227公斤)。

Jars of oil from river dolphin fat sit alongside oil from anacondas and crocodiles.

用粉红海豚脂肪制成的油被装在罐内，与森蚺油、鳄鱼油一起被摆摊上出售。

Living mainly in South American rivers that feed the Amazon, Anacondas spend most of their time in the water.

水蟒主要栖息在滋润亚马逊地区的南美众多河流中，这使得它们生命中的大多时间都生活在水里。