Trivia
The unexpectedly expressive kashishi

Here is one of the rarer idiophones. The African kashishi is a percussion instrument that consists of a basket-like body with large peas or beans inside, and it produces a sound when the beans hit the hard bottom. The bottom is made of calabash. Many African percussion instruments make use of natural materials such as these, and the sounds are warm and earthy. The beans actually strike the basket in many places, not only the bottom, and by shaking the instrument in different ways a richly nuanced rhythm can be created.
There is so much to these instruments, it could be said that percussion starts and ends with idiophones. You should take some time to look check them out.