During the GDC 2018 conference, Richard Oud from Guerrilla Games talked about the creation of the machines in Horizon Zero Dawn, showed the workflow of the whole development team and gave some advice on the production process. 

Lead animator from Guerrilla Games, Richard Oud, did a huge breakdown on the production of the mechanical beasts in the Horizon Zero Dawn game. In the talk, Richard discussed their production workflow, covered the technical side of animation, the creation of believable beasts' movements from the players' view, in particular. He also showed each step of it and discussed the biggest challenges they have faced. 

Horizon Zero Dawn is an RPG about the apocalyptic future where the machines of the unknown origin dominate the world. To survive, humans have to fight with the beasts using futuristic weapons. The game was developed by Guerrilla Games, a Holland-based studio that has worked on the Killzone franchise.

You can purchase the game on PlayStation.