Arsinoitherium is an extinct genus of prehistoric mammal from the Late Eocene epoch. It was planned to appear in the original King Kong using a stop motion puppet originally created for Willis O'Brien's Creation, before being replaced by Styracosaurus. Arsinoitherium was later considered for the 2005 remake directed by Peter Jackson but was scrapped once again.
In the test reel, the Arsinoitherium was to appear during the log scene where it chased and charged at the Wanderer crewmen out of the jungle and led them to the log that King Kong attacks. Director Merian C. Cooper then reshot the scene using Styracosaurus instead. Ultimately, the Arsinoitherium and the Styracosaurus was cut from the final film.
During early pre-production in 2003, Greg Broadmore created a piece of concept art he later referred to as "Rhino on Holiday" that prominently featured an Arsinoitherium in the jungle with two pterosaurs similar to Dimorphodon and Peteinosaurus around the animal. The creature did not end up being used in the finished film.
Arsinoitheriums appear as a common beast of burden in ancient Atlantis until virtually being whipped out alongside most of the civilization's other inhabitants during the Apocalyptic infestation of the voracious Gyaos.
- The front horns of the Arsinoitherium stop motion puppet created for 1933 film were made of wood attached to its armature by liquid latex.
- Ray Harryhausen planned to have an Arsinoitherium appear in Sinbad and The Eye of the Tiger (1977) as one of the still living prehistoric fauna of Hyperborea, even making pre-production concept art of the beast fighting the giant humanoid Troglodyte. The inclusion was a direct homage to the unused Arsinoitherium from both Creation and King Kong but, ironically, Harryhausen's version also didn't make the final cut either.
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