The Rasp is a traditional percussion instrument in many Indigenous culture in the Americas and around the world. The Southern Ute Nation call it a “Bear Growler”, in Central America it is called a Güiro (often made from a hollow gourd), many people associate the sound with Bullfrogs…other nations have other names (please comment if you know of any); but it is a Rasp in the end.
These are made by cutting equal sized and spaced ridges into a branch that is then rubbed with a smaller stick or bone. I have made these from Willow branches; retrieved from a large tree that fell during a windstorm. Some evoke shapes of animals, though all have followed the natural shape of the wood, with only a little extra modification here or there.