Gecko (creature)

Geckos are a common critter in Fallout 2. They appear in several forms:

Little geckos:
The little/normal Geckos are the easiest of them to kill. They appear quite early in the game. (already in the Fallout 2 Quest - Rescue Smoke, where they roam the Arroyo Hunting Grounds) They can be skinned, if you have the Gecko Skinning perk.

Little Geckos, at least the ones in the Hunting Grounds, have very strange sight patterns. Sometimes you can walk right in front of them and they won't attack you, other times they will see and attack you from the other side of the screen.

Golden geckos:
This is the more beautiful, but also more deadly kind. As stated by Smiley, the Trapper from the Quest Rescue Smiley the Trapper, they can be found near toxic waste, which they seem to lick up. Though it's not said explicitly, obviously there seems to be a connection between the toxic/radioactive waste and the golden Geckos. It can be assumed that exposure to some kind of toxic/radioactive material turns a normal Gecko into a golden one. They can be skinned, if you have the Gecko Skinning perk.

Fire geckos:
The most deadly kind of Geckos, they appear mostly in late game and as indicated by their name, can breathe fire. Those things are quite hard to kill and as opposed to both other forms can not be skinned, except in the Restoration Mod.

Gekon Геккон