Serving as the supervising animator on the eagle character Marahute, Glen Keane studied six eagles residing at the Peregrine Fund in Boise, Idaho, as well as a stuffed American eagle loaned from the Los Angeles Museum of Natural History and an eagle skeleton. While animating the eagle, Keane and his animation crew enlarged the bird, shrunk its head, elongated its neck and wings, and puffed out its chest. Additionally, Keane had to slow the bird's wing movements to about 25–30 percent of an eagle's flight speed. Because of the excessive details on Marahute who carried 200 feathers, the character only appeared in seven minutes during the opening and ending sequences.