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An Excavator is a heavy utility machine designed to transport objects like a normal crane but can also move them anywhere easily. An excavator usually consists of wheel/thread, body, arm, and grabber. Next is the comparison between a tower crane and an excavator, to make things clearer.

Excavator

Example of an excavator

Tower Crane Excavator
Arm Straight arm with the grabber on the edge Arm has joints and connected from the lower body
Shape T- Shaped Figute Like a normal vehicle but with it's excavating arm
Pros High Stability and Strength High Mobility and Precision Relocation
Cons Very Tall & Heavy

Can't move quickly

Most arm has low stability
Mobility Mostly Stationery With Wheel/Tank Thread