A project to protect water voles on rivers in Suffolk has been a huge success, according to wildlife experts.
Water voles had disappeared from the River Stour.
The recovery of the population was confirmed by a survey in 2009 that found them around Bures and at other locations along the river.
The Environment Agency said it was as a result of improved water quality, habitat improvement work and control of the water voles' main predator, mink.
The Environment Agency said it had brought about some of the changes through its Water for Wildlife partnership.
Chris Strachan from the Environment Agency, said: "The improvements in water voles' fortunes are due to the hard work and dedication of lots of people, many of them working voluntarily.
"It is very heartening to be involved in such a co-operative project involving agencies, project officers and landowners all working towards a common goal."