麻豆约拍

The River Don was once one of the most polluted stretches of water in Europe.

But now, with dirty heavy industry gone, the banks of the river have new residents -- otters.

As Dan Johnson reports, the creatures have been spotted living in some of the busiest and noisiest parts of Sheffield.

(Photo: River otters at Tippecanoe River State Park, in Indiana. Credit:Department of Natural Resources)