Mount Rushmore climbers to monitor and seal cracks annually. Due to budget constraints, the memorial is not regularly cleaned to remove lichens. However, on July 8, 2005, Alfred Kärcher GmbH, a German manufacturer of pressure washing and steam cleaning machines, conducted a free cleanup operation which lasted several weeks, using pressurized water at over . The flora and fauna of Mount Rushmore are similar to those of the rest of the Black Hills region of South Dakota. Birds including the turkey vulture, bald eagle, hawk, and meadowlark fly around Mount Rushmore, occasionally making nesting spots in the ledges of the mountain. Smaller
Mount Rushmore in popular culture Rich family has their own version of Mount Rushmore, named Mount Richmore in the movie, built on their property with their own faces sculpted into it. It becomes the setting for the film's finale, echoing the finale of "North by Northwest". The WWE had their own version of Mount Rushmore consisting of the best wrestlers in the company's history. The ones sculpted into the mountain are The Undertaker, Steve Austin, John Cena, and Hulk Hogan. The memorial was famously used as the location of the climactic chase scene in Alfred Hitchcock's 1959 movie "North by Northwest". The scene was developed