Deathclaw

Deathclaws are creatures found after the war.

Background
Deathclaws were viewed as legendary creatures by inhabitants of American southwest. A single deathclaw was found living near the outskirts of the Hub. The Appalachian Enclave's research division noted that the genetic manipulation looks similar to their own projects.

Behind the scenes

 * According to Scott Campbell, the initial design for the deathclaw in Fallout was that of a very furry FEV-hybrid of wolverine and brown bear, which was later replaced by the model of a Tarrasque which was produced for Planescape: Torment, but ended up being unused. Chris Taylor also stated that the hairy version was canceled due to technical limitations at that time, with the original concept being later revived for Fallout: Tactics.
 * According to the Fallout Bible, the deathclaw was modeled after a Tarrasque from Dungeons & Dragons.
 * Jonah Lobe worked on deathclaws in Fallout 3 and re-designed them for Fallout 4, incorporating chameleons, alligators, bulls, panthers, serpents, & lizards into their design. 