The water vole, a 'red list' species with a 90 per cent decline in numbers over the last 30 years, has moved into Hull Road Park.
This comes after work in Tang Hall and Osbaldwick becks to help increase the animal population.
It has been five years since any official recordings of water voles on the becks and none have ever been recorded in the Hull Road Park.
The water vole lives along vegetated banks of slow-flowing streams, rivers and ponds and in this case has been found in Osbaldwick beck that runs through the park.
Gail Hammond, environment programme manager at the Environment Agency, said: "The water vole has undergone one of the most catastrophic declines of any species in the UK, so we have been working hard to improve habitat for water voles across Yorkshire.
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