The term 'well-known whale' can be summarized by the crossword solution 'Shamu', which is a 5 letter word. Shamu is the name of a killer whale that was featured in SeaWorld shows from the 1960s to the 1990s. The whale was originally captured off the coast of British Columbia in 1965 and was the first orca to be displayed in a public aquarium. Shamu became an iconic figure in the marine mammal entertainment industry and was featured in numerous television shows, films, and other media.