Nestled in the forests of Canada sits the world’s longest beaver dam. This 850-meter-long structure is large enough to be seen in satellite imagery and has dramatically transformed the region, creating a pond containing 70 million litres of water. But dams of any size can have huge impacts on their environment. So how exactly do beavers build these impressive structures?

在加拿大的森林中坐落着世界上最长的海狸坝。这个850米长的结构大到可以在卫星图像中看到，并且极大地改变了该地区，创造了一个包含7000万升水的池塘。但是，任何规模的大坝都会对其环境产生巨大影响。那么，海狸究竟是如何建造这些令人印象深刻的结构的呢？