Water voles suffered from the introduction of carnivorous mink and the pollution of streams.
During the worst of the weather, staff fed the owls with voles and mice.
Voles were released in several areas of the Loch Ard forest near Aberfoyle, Stirling, three years ago.
In the past, we've cleaned out both sides of the drain, which really upsets the water voles.
BBC: Conservation project in Goole aims to boost water voles
In addition, 10 brand new areas where water voles have dispersed to by themselves have also been recorded.
James Silvey, from the Trossachs Water Vole Project, said the voles now had an "established population" in the forest.
Farm manager Euan Fraser said that knowing the location of the voles would help minimise the farm's impact on their habitats.
BBC: Conservation project in Goole aims to boost water voles
And as fish stock increases, so too will wildlife connected to the river system, including otters, water voles and bird life.
By working with landowners, he is hoping to help protect water voles already living in the area and is encouraging them to spread.
BBC: Conservation project in Goole aims to boost water voles
The British Vole Club blames the imported American minks - many of which have escaped into the wild from farms - for the decline in voles.
At some of the sites, wide margins of rough grass have been created near nest box sites to ensure the owls have enough voles to feed on.
Much of the oxytocin research to date has been done on prairie voles, monogamous rodents that will release oxytocin only when touching a family member, Pollak says.
This sounds miraculous, and you will indeed notice and marvel at the difference, but only if you happen to be a snowy owl who likes watching voles from a hundred and fifty yards.
The Yorkshire Wildlife Trust will be recording the water voles' movements at the farm, which will be used for research and educational purposes, allowing the public to catch a rare glimpse of the secretive creatures.
BBC: Conservation project in Goole aims to boost water voles
Europe is home to a rich diversity of native mammal species ranging from the small such as shrews and voles, to the large such as wolves and brown bears. to the enormous -- in the case of the 70-ton North Atlantic Right Whale.
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