As requested and promised, here is the first part of Mutants Be Gone for New Vegas. I may release more replacements at a later date, but this was the only one I really felt obligated to make ASAP, because Geckos are really, really dumb. 

I don't like Geckos. They look weird and breath fire, which doesn't make much sense at all. This mod is for people that would like to see them go far, far away. 

You have two choices- You can replace them with Feral Ghouls, or replace them all with Tunnelers. Gameplay wise, Tunnelers are a far more difficult choice, so be careful.

Obviously, Lonesome Road is required for the Tunneler file to work.

Enjoy!