vintagemickeymouse:

“It was a difficult picture because we’d never done any animal with anatomy and Walt wanted the deer to be very believable.” - Ollie Johnston, Animator 

“Walt’s idea was to get all of his artists to draw in the way of the old masters and then put them to animation. They started bringing in real animals and having them on the sound stages and it became a zoo in itself.” - Mel Shaw, Animator