I'm Aisha Roscoe, and this is a Sunday story from Up First.
Today, we're headed to London.
Please mind the gap between the train and the platform.
To a tube station underground.
The train now approaching is to Upping.
Please stand back from the platform edge.
This particular tube station is lined with sandbags because for years it had a big problem, flooding.
Whenever it rained, the floor of the ticket office would fill with water.
Now, the sandbags aren't really needed.
The flooding problem has been solved by some newcomers who were determined to halt the water.
To do it, they labored at dawn and dusk and even put their children to work.
One day this spring, NPR's Lauren Frayer decided she needed to meet these industrious problem solvers.
So she prepped up to the family's muddy doorstep.
So this is their house?
This is their home, yes.
With a local named Elliot Newton.
So it might just look like a pile of sticks, but this is actually an incredibly complex sort of architectural feature.
A pile of sticks, a strange creation, but completely normal for who Lauren had come to see, beavers.
You can see the amazing wetland engineering that the beavers have been doing.
And I think this is one of the most impressive dams that they've built.