Castor Californicus, commonly known as the California beaver, is a large, semi-aquatic rodent that is found primarily in the western regions of North America. While the scientific name Castor Californicus is the most accurate term to describe this animal, there are a few synonyms that are commonly used in its place. These include the North American beaver, the Pacific beaver, and the American beaver. Additionally, some people may refer to the Castor Californicus simply as a "beaver," without any geographical or taxonomic qualifiers. Regardless of the specific name used, this remarkable animal is an important part of Western ecosystems and plays a vital role in maintaining healthy environments for a variety of other species.