The Eurasian beaver, or Castor fiber, has been known by a variety of names over the centuries. In different parts of Europe, it has been called the European beaver, the common beaver, or simply the beaver. In some areas of Russia, it is known as the "river otter" or "river beaver." The scientific name, Castor fiber, refers to its robust, well-developed teeth and unique adaptations for aquatic life. Other synonyms for this species might include the Eurasian water beaver or Eurasian river beaver. Overall, these names all refer to the same fascinating animal, which has played an important role in European and global ecology for thousands of years.