Deathclaw (Fallout: New Vegas)

Deathclaws are an enormously large, agile, and strong species of mutant chameleons created through genetic engineering. They are substantially larger than a human, and have large and dangerous claws. However, due to mutation, they have lost their camouflage ability.

Hints: Deathclaws have very keen eyesight and can even see enemies that are cloaked with devices such as stealth-boys.

Background
The deathclaws were originally created before the "Great War" by the United States Military in order to replace humans during high-risk close-combat search-and-destroy missions. They were Jackson's Chameleons genetically modified with the DNA of various other species.