General:
* Motile: This is a scientific term, usually referring to organisms that can move on their own.
* Self-propelled: This emphasizes the ability to move without external force.
* Autonomous: This emphasizes the ability to make decisions and move independently without external control.
* Mobile: This simply means capable of moving.
Specific to animals:
* Locomotor: This refers to the ability to move from place to place.
* Ambulatory: This means able to walk or move about.
* Agile: This emphasizes speed and ease of movement.
Specific to objects:
* Self-driving: This refers to vehicles that can navigate without human input.
* Robotic: This refers to machines that can move and perform tasks independently.
Other possibilities:
* Free-ranging: This implies the ability to move without restrictions.
* Untethered: This implies freedom from physical constraints.
* Independent: This emphasizes the lack of reliance on external factors.
The best word for your specific situation depends on the context and the nuance you want to convey.