Arvicerennia

Arvicerennia is a genus of small to medium-sized mammals belonging to the family Cricetidae, which includes hamsters, voles, and lemmings. The genus is native to the Palearctic region, encompassing Europe, Asia, and North Africa. Arvicerennia species are known for their semi-aquatic lifestyle, inhabiting freshwater and brackish water environments such as rivers, lakes, and marshes.

The genus includes several species, with the most well-known being the European water vole (Arvicerennia amphibius). These voles are characterized by their dense, water-repellent fur, which helps them stay warm in cold water. They have a streamlined body, short legs, and a broad tail that acts as a rudder for swimming. Their diet primarily consists of aquatic plants, but they may also consume small invertebrates.

Arvicerennia species are seasonal breeders, with breeding occurring in the spring. They are monogamous and build nests in the water or on land. The young are born in the summer and are dependent on their parents for food and protection. These voles play a significant role in their ecosystems, serving as a food source for various predators and contributing to the nutrient cycling in aquatic environments.

Despite their ecological importance, some Arvicerennia species face threats from habitat loss and degradation due to human activities such as water pollution, dam construction, and climate change. Conservation efforts are in place to protect these semi-aquatic mammals and their habitats.