The surprise return of beavers to the British countryside brings benefits and controversy for humans and wildlife alike. The work of these famously busy rodents increases local biodiversity, reduces storm-induced flooding, and restores wilderness to a highly manicured landscape. It also injects some chaos into the lives of the beavers’ human neighbors. Can the British beavers regain their former glory as powerful ecosystem engineers, or is their new home too domesticated to return to the wild?