Return of the Ratty: Water Voles Reclaim Surrey River

Signs of success are abundant in Surrey's Hogsmill River, where water voles, once thought locally extinct, are now thriving. Approximately one year ago, 42 water voles were released into the chalk stream by the South East Rivers Trust and Citizen Zoo. Recent evidence, including droppings, burrows, and camera trap footage, indicates that the population has not only survived but is flourishing both upstream and downstream of the original release site.

The resurgence of water voles is closely linked to conservation efforts targeting invasive mink. Laura Nee, catchment officer for the South East Rivers Trust, highlighted that removing these predators is vital, as they prey on numerous native species daily. Water voles, famously known as 'Ratty' from The Wind in the Willows, had disappeared from the county for over two decades. Their successful return to the Hogsmill River marks a significant milestone.

Conservationists like Pia Trevelyan-Ashby are diligently monitoring the water vole population. Methods include searching for their distinctive droppings, often found in 'latrine rafts' or active burrows, which serve as territorial markers. The presence of these rodents is a key indicator of a healthy river ecosystem. They help manage vegetation and serve as a food source for other wildlife, playing an essential role in maintaining a dynamic natural balance.