A new analysis of data collected over 10 years by a network of experts led by The Wildlife Trusts has revealed that water vole distribution has declined dramatically. There has been a 30% decline in the places where these river mammals once lived across England and Wales during the survey period 2006 – 2015. While the new analysis reveals a slight increase in distribution in recent years – thanks to some successful conservation efforts by The Wildlife Trusts and others – the full data covering the whole 10 years paints a bleak picture.