Re: Other than drums ....
The piano is not usually thought of as a percussion instrument because it never seems to be in the back in the percussion section. But it is indeed percussion since as I stated before it has hammers that hit the strings, not pluck them. Think of the hammers as drum sticks hitting strings. A series of fulcrums and levers connect the keys to the hammers. Just as you have fulcrum in your joints moving the body parts and the sticks.
My Father WAS a Rocket Scientist!