Evolution of cetaceans decreasing. Other historical climate events can be correlated and matched with the genome history of the Yangtze River dolphin as well. This shows how global and local climate change can drastically affect a genome, leading to changes in fitness, survival, and evolution of a species. The European population of common dolphins ("Delphinus delphis") in the Mediterranean have differentiated into two types: eastern and western. According to a 2012 study, this seems to be due to a recent bottleneck as well, which drastically decreased the size of the eastern Mediterranean population. Also, the lack of population structure between the western and
Creature from the Black Lagoon of the Creature" wherein the Gill-man killed a guard in this fashion). "Creature from the Black Lagoon" spawned two sequels: "Revenge of the Creature" (1955), which was also filmed and released in 3D in hopes of reviving the format, and "The Creature Walks Among Us" (1956), filmed in 2D. A comedic appearance with Abbott and Costello on an episode of "The Colgate Comedy Hour" aired prior to the film's release. The appearance is commonly known as "Abbott and Costello Meet the Creature from the Black Lagoon". In 1982, John Landis wanted Jack Arnold to direct a remake of the film,