There are a multitude of different robots for very diverse applications, and depending on the need that you want to solve, so are the movements that the robot has to be able to carry it out.
But I have seen a development made at Northeastern University that has surprised me by the large number of different movements it has. It can move on 2 or 4 wheels, walk, and even fly.
They have called it Multi-Modal Mobility Morphobot (M4) and it is like a small cart, 70 cm. long by 35 cm. high, which only weighs 6 Kg. including battery, computer, sensors, etc…. and may have the capacity to perform functions autonomously.
The M4 body is made up of several modules, each containing a different type of actuator. These actuators can be used to create wheels, legs, or thrusters. The robot can then combine these components in different ways to create different modes of locomotion.
For example, M4 can use its wheels to roll on a flat surface. It can also use its feet to crawl over uneven ground. And if you need to fly, you can use your thrusters to take off and land.
It is clear to me that it is a theoretical exercise carried out by researchers from a university, but applications to solve real problems can be obtained later from similar prototypes.
And you can see a very interesting video at: https://youtu.be/S4eQXXxUnNE
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