Why do most animations have 4 fingers not 5?
 

https://estaticos-cdn.prensaiberica...._default_0.jpg

https://www.refinery29.com/images/85...864&quality=85

So you know they're not real

“Everybody shortens it to three fingers and a thumb... just simply for an economy of line.
When you're having to animate 24 drawings per second, dropping one finger makes a
huge difference,"

Lazy graphic cartoonists , couldn't be bothered to draw an extra finger .

Well there you go.

Nah, its thickness issues..5 fingers would have to be a evil looking skinny hand.