I'm coming for you!

A horse fly. Evil things. It's the one insect, or one of the ones, that I wonder, what IS their purpose, really? They do no good... they just suck blood & they love human blood the most. Least they're slow. I never kill them, I just stun them. But it's only since digital photography & macro most of all, that I've really noticed them & their amazing eye colouration! Best viewed larger.