A pilot project reintroducing beavers to the Holnicote estate in Somerset has created a lush, wet area that stands out in the otherwise dry and dusty countryside. This green oasis has emerged thanks to the return of an animal that was once extinct in Britain, largely due to hunting. The beavers, reintroduced six years ago, have transformed a small stream into a wet meadow, providing a striking contrast to the surrounding landscape during the summer heat. Beavers are known as ecosystem engineers because of their ability to shape their environment. They fell trees, build dams, and dig channels, which help store water and create a variety of wetland habitats. This process involves water pooling behind dams, spreading through valleys, and soaking into the soil. As a result, wetlands with beavers often feature a mix of ponds, marshes, and wooded areas. These wetlands can retain water longer during dry periods, offering a natural buffer against drought. Studies have shown the significant impact of beavers on water retention. In a 2008 study of Elk Island National Park in Canada, researchers found that the return of beavers in 1954 led to a dramatic increase in open water areas, with beaver activity explaining over 80% of the variation in wetland size. More recently, in Devon, researchers found that 13 beaver dams stored about 1 million litres of water, helping to maintain stream flow during dry spells. Across four wild beaver territories in Devon, the total water stored in wetlands was estimated at over 24 million litres. The ability of beavers to retain water has benefits beyond just water management. It helps keep vegetation green, which can reduce the risk of wildfires. A 2020 study in the western US found that vegetation near beaver dams was three times less affected by wildfires than areas without beavers. However, reintroducing beavers is not without challenges. Their activities can flood farmland, block culverts, and damage trees, requiring careful planning and management. In England, any beaver release now requires a licence and a management plan to address these concerns. While beavers can make a valuable contribution to water retention and landscape resilience, they are not a complete solution. Other efforts, such as restoring peatlands, reconnecting rivers with floodplains, and creating vegetated buffer zones, are also needed. The UK could benefit from a network of wetland areas, often referred to as a "welly belt," where wet conditions are seen as a natural feature rather than a problem. Beaver-created wetlands could be a key part of this network, provided they are managed properly. Recent sightings in Norfolk highlight the need for careful planning, as uncontrolled reintroductions can lead to unintended consequences. While beavers won't end droughts or wildfires, they can help restore water to landscapes that have been drained over centuries, keeping it available when it's needed most.