Schreber of Navarro, whose report led to the extermination of intelligent deathclaws with extreme prejudice. However, their intelligence was discovered by Dr. They began developing a unique culture, as the first known non-humanoid sentient beings in history. Following their first combat test, the deathclaws broke free of their Enclave masters, becoming far more intelligent than anyone could foresee. On May 17, 2242, the first successful pack was dropped into Vault 13 to cloak the presence of the Enclave and their abduction of the dwellers within. As stated above, the Enclave eventually continued their research project started before the war, developing intelligent deathclaws for use in hostile environments around 2235. Their gradual spread throughout the wasteland raised awareness of their existence, until they entered common consciousness as a lethal predator. Also, a single deathclaw was found living near the outskirts of the Hub. However, the population in the Boneyard was keenly aware of their existence, as a single den mother and her offspring claimed the area between Downey and Norwalk around 2161, keeping the Gun Runners in a checkmate while terrorizing other communities in the region. Because initial reports were limited to a series of isolated nests, deathclaws were viewed as legendary creatures by the various inhabitants of southern California. Eventually, they were refined by the Master through genetic manipulation and the Forced Evolutionary Virus. The Enclave had no hand in the deathclaw's creation, so far as the Appalachian Enclave's research division knows, but they do note that the genetic manipulation looks similar to their own projects.

After the Great War, deathclaws escaped into the wild and quickly spread across the continent. Although the project was successful in creating a ferocious predator capable of surviving on its own in the wild, no references exist of them ever being deployed on the battlefield. government as a cheap replacement for human troops during combat operations, deathclaws were derived from a mixed animal stock, primarily the popular Jackson's Chameleon. Originally engineered before the Great War by the U.S.

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