Cazador.

 

Do you see this?
This is a cazador.
It's fast, hard to kill, hits like a truck, and extremely poisonous. Get hit once by them at my level, and you can basically just reload, because unless you use all your healing supplies, you're gonna die.
They've been the bane of my existence for the last hour.
I want to kill them all. With fire. This is my first personal vendetta in New Vegas. I will kill. Each. And every. One. Of. These. Bastards.
Anyway, I found my base...

Whoopdeedoo...