Beavers were a mammalian animal lifeform native to the planet Earth and known for building dam structures.
History and specificsEdit
In 2158, Trip Tucker said that whatever Tal Shiar scans picked up on Carraya IV it certainly wasn't a beaver building a dam. (ENT - The Romulan War novel: To Brave the Storm)
Katherine Pulaski categorized scientists that purposely genetically modified plasma plague strains as being "eager beavers" and had to explain the slang term to Data. (TNG episode: "The Child")