Gecko (Fallout 2)

Geckos are creatures found

Gameplay
Their durable hides and pelts are used for manufacturing leather implements, such as leather armor. Gecko meat is also used as food. Klamath citizens mention that if the creatures are cooked correctly, it tastes like canned chicken. Golden geckos can be found around irradiated areas where they lick up toxic waste.

Little gecko
They appear early in the game when the player character embarks on a quest to save a dog in the hunting grounds of Arroyo, where a small population of geckos roam. Little geckos will eat any iguana-on-a-stick or meat jerky dropped. They will also equip unarmed weaponry like spiked knuckles and power fists.

Fire gecko
The fire gecko is the most lethal of all geckos, breathing fire while immune to fire damage.

Appearances
Geckos appear

Behind the scenes
The Fallout Bible describes gecko lizards as having been infected by FEV alongside mantises, rats, brahmin, scorpions, ants, and the Venus flytrap. The document continues to state that the species that they are descended from is unknown, but that FEV mutated them to be larger, stronger, and faster, able to procreate quickly.