This giant claw with a vehicle attached to it is a Volvo L180HL, a front-loader-based machine designed for moving logs. Lots of them.
This brilliant Technic recreation of the log-grabbing Volvo is the work of Akassin of Eurobricks, who built it for a recent Technic competition in which it took the silver medal.
A wealth of mechanical and pneumatic functions accurately replicate the real machine, with articulated steering, an enormous (and rather clever) two-piece boom powered by compressed air, plus a mechanical claw that’s able to grab bundles of ‘logs’.
It’s a hugely impressive creation with much more to see at the Eurobricks forum, and via the excellent video below. Grab some wood via the links.