with humans. To gain a better understanding of the history of the planet the studio received guidance from Roy Chapman Andrews, the director of the American Museum of Natural History, English biologist Julian Huxley, paleontologist Barnum Brown, and astronomer Edwin Hubble. Animators studied comets and nebulae at the Mount Wilson Observatory, and observed a herd of iguanas and a baby alligator that were brought into the studio. The viewpoint was kept low throughout the segment to heighten the immensity of the dinosaurs. The Pastoral Symphony According to Ward Kimball, the animators were "extremely specific on touchy issues". In the making of The Pastoral Symphony Greek mythological segment, the female centaurs were originally drawn bare-breasted, but the Hays office enforcing the Motion Picture Production Code insisted that they discreetly hung garlands around the necks. The male centaurs were also toned down to appear less intimidating to the audience. Originally, the segment included a pair of black centaurs who tended to the others, but these were cut from the film in later releases for sensitivity reasons (see ). Dance of the Hours Dance of the Hours was directed by Norman Ferguson and Thornton Hee and was completed by eleven animators. Most of the story was outlined in a meeting in October 1938, including the creation of the main alligator character, Ben Ali Gator. Its story, direction, layout, and animation underwent several rewrites, yet Disney wanted to present animals perform a legitimate caricature ballet sequence with comedic "slips". The design of the elephants and alligators were based on those by German illustrator Heinrich Kley, while the hippos and ostriches were based on those by cartoonist T. S. Sullivant. To gain a better idea on the animals' movements, the crew visited Griffith Park Zoo in Los Angeles. Animator John Hench was assigned to work on the segment, but resisted as he knew little about ballet. Disney then gave Hench season tickets to the Ballet Russe de Monte Carlo with backstage access so he could learn more about it. The studio filmed several people in live action to help with the animation of the characters. The lead ostrich, Madmoiselle Upanova, is based on Irina Baronova. Hyacinth Hippo, the prima ballerina, was inspired by dancers Marge Champion and Tatiana Riabouchinska and actress Hattie Noel who weighed over , the animators studying the "least quiver of her flesh, noticing those parts of her anatomy that were subjected