An organism that has a skeletal system is called an animal.

While not all animals have *bones*, all animals have some kind of skeletal structure. This can be:

* Endoskeleton: An internal skeleton made of bone or cartilage (like in humans, fish, birds)

* Exoskeleton: An external skeleton made of chitin or other hard materials (like in insects, crustaceans)

* Hydrostatic skeleton: A skeleton made of fluid pressure within the body (like in worms, jellyfish)

Let me know if you want to know more about the different types of skeletal systems!