You're probably thinking that Mickey Mouse only has FOUR fingers, and you'd be correct.
Disney explained that the reason Mickey only has three fingers and a thumb is for both artistic and financial reasons.
Disney said if Mickey had five fingers, his hand would look weird, "five digits are too many for a mouse, it would look like a bunch of bananas."
The second reason for Mickey only having four fingers is financial.
A 6 1/2 minute short film contains about 45,000 drawings.
Disney says if you add up the time saved by NOT drawing that fifth finger, you'd find that the studio has saved millions of dollars.