Castoridae is a family of rodent species commonly known as beavers. However, there are also several other synonyms for this term, such as Castorimorpha, Castoroidea, and Castorinae. These species are often characterized by their semi-aquatic lifestyles, rectangular flat tails, webbed hind feet, and large incisors. Although originally found in North America, several species have been introduced to other regions of the world for their value in controlling water flow and creating wetlands. Other notable characteristics of beavers include their dam building abilities and their importance to indigenous cultures for their fur, meat, and other uses. Castoridae is a fascinating family of rodents that have played an important role in shaping ecosystems and human history.