Rats gnawing their way through concrete
![Rats gnawing their way through concrete](https://cc-production-uploads-bucket.s3.amazonaws.com/uploads/2017/10/001_RBI-image-1010755.jpeg)
Rats gnawing their way through concrete
Concrete 's strength is being tested by a new foe. Last year, Swedish newspaper Aftonbladet reported on a so-called "Viking Rat" that gnawed though the concrete wall of a home belonging to the Bengtsson-Korsas family.