Castor Canadensis is commonly known as the North American beaver, a large semi-aquatic rodent that is found in Canada and the United States. There are several synonyms for Castor Canadensis, including Canadian beaver, American beaver, and simply beaver. Other synonyms include brown beaver, western beaver, and northern beaver. The Latin name for beaver is derived from the Greek word kastor, which means beaver. The North American beaver is known for its distinctive flat tail, which it uses to swim, communicate, and slap the surface of the water to warn other beavers of danger. Despite being hunted extensively for their fur, beavers have made a remarkable recovery in recent decades thanks to conservation efforts.