Why So Sad...?

Why So Sad? / All Rights Reserved, originally uploaded by spotty photo.

I went to Dudley Zoo for the first time in nearly 2 years today. Since my last visit they have had a troop Baboons and this is the male.
Now from a technical point of view, this is pretty awful. It was shot at something like 3000+ ISO because it was raining, he was under trees and I needed a decent shutter speed so it’s choc full of noise.
His eyes just look so sad, I wonder why.

Thanks for looking!

Spotty