Making a model skeleton requires some knowledge of anatomy. Determine what animal skeleton will be made. Animals with four legs will be easier to display, as they will not require additional support. Choose an animal large enough to be easily made. A mouse skeleton is too small to effectively display.
Review the diagram of the chosen animal's skeleton. Mold bones from the white clay. If specific bones need to be highlighted as part of a project, use a different colour of clay for those particular bones. Begin with the bones in the tail and work toward the skull. Do not make the skull yet. Set all the bones aside to dry.
Lay the dry bones in the order they should be attached. Use the grey clay to represent the connective tissue and attach the bones to each other. Use glue as required to hold them in place. Set the completed skeleton aside to dry.
Mold the skull from two pieces of white clay. One piece is the lower jaw and the other is the remainder of the skull. Allow the pieces to dry. Glue the lower jaw onto the skull and allow it to dry. Once the skull is dry, glue it to the remainder of the skeleton.
A more permanent model can be made using plaster to create the bones, rather than clay. Molds for human bones and some other animals may be available at hobby stores. Modelling foam will be lighter than clay. A lighter model will be easier to move when necessary. Use play dough tools to help shape the clay,