effect. For his part, Bakker commented that "Willis O'Brien was a scholarly man, anatomically literate he went to the American museum, he saw the skeletons, he thought about them, he saw Knight's paintings and the sculptures. He listened to Osborn's ideas and although T. rex has a bit part in the movie, T. rex influence is huge." O'Brien was again responsible for special effects in the 1933 monster movie King Kong, which featured a climactic battle between the giant ape and a Tyrannosaurus. This scene is credited with the film's success both in terms of cinematic experience and in securing financial backing. In a 2005 tongue in cheek mockumentary, "T. Rex: A Dinosaur in Hollywood," no one less than Kong himself explained why. "Well, I had to find a suitably impressive monster to showoff my great strength and ruthlessness. There was only one real choice!" In real life, film historian and Kong scholar Ray Morton agreed with the previous statement. According to Morton, RKO film studio wanted to halt production on King Kong on account of it going over budget. Merian C Cooper, Kong's creator, then showed the studio heads a 20 minute test reel he and his team had made. The footage was of T. Rex's fight with Kong and was this scene that convinced the studio heads that the film had to be made, regardless of costs. O'Brien had not originally meant to create Kong, instead seeking to make a film about a lost island of dinosaurs wherein the T. rex would have featured in the climax. When this film, Creation was cancelled, O'Brien used the T. rex model he had made and reused it (along with other dinosaur models) for King Kong. The Tyrannosaurus model was made using a cast based on an early painting by Charles R. Knight. O'Brien stated that the battle between Kong and the Tyrannosaurus was one of the most technically difficult scenes in the film to animate. Many early films depicted Tyrannosaurus with an upright posture based on the current thinking of the time. Most of these films inaccurately portrayed the dinosaur with three prominent fingers on each hand like Allosaurus (though Tyrannosaurus had a third, vestigial finger, it would not have been noticeable at first glance); Walt Disney is reported to have informed dinosaur hunter Barnum Brown that "it looked better that way", and the creature was depicted as such as