Why do we have show our ears in our passport photo?

[anna]

Today I had to take a passport photo.I asked my mom why do we have to show our ears?She didn't know so I'm really wondering..y

 

[David]

To make sure you dont have pointy ear like Mr Spock
Vulcans are not allowed to have passports

 

[mt03 ben]

cameras that need full face recognition at the airports.

 

[jaker]

They don't want you to grin either for the same reason.