Nature lovers are being urged to visit their local canal, river or reservoir in South Yorkshire to record sightings of water voles.
The Canal and River Trust wants to hear from people water votes, with numbers in decline.
Analysis of water vole sightings dating back to 1970 has highlighted a decline in water voles over the last 45 years, with the last 15 years showing the most dramatic decline and the species disappearing from 15 counties and districts.
Mark Robinson, national ecologist for the Canal and River Trust, said: “Water voles are synonymous with British watercourses, they are the largest of the vole family but they are one of the most endangered.”
Visit www.canalrivertrust.org.uk/great-nature-watch for more details.