More mutant wildlife

[Gizmojunk]

As I understood it... they were looking for another big baddie for the Fallout game, and had the ready made (for D&D) maquette on the shelf.

they are quadrupeds, their arms have more muscles mass and duple the size than the legs

This is true for gorillas, and Deathclaws are said to have been created using ape DNA, as well as samples from Jackson's chameleons.