North American Water Voles can swim and dive, and are always found near water, often near fast-running glacial or spring-fed streams. Captive young Voles swam voluntarily when they were only 17 days old, before they were even weaned. Learn more about the Microtus richardsoni, more commonly known as a North American Water Vole, in this easy-to-read species overview by the Smithsonian's National Museum of Natural History.