CROOKET ARROW told me the IRQOUIS made them into rawhide solfen and braided, twisted them into bow strings. He once did it for me. Took 6 fox squirrels to make a braided raw hide string. Boiled in the brains to get the raw hide suple (solf),braided it while wet it let it dry, finished with heat gun and bee's wax.
He said fox squirrel makes a tuffer string than grays. I hav'nt had any exsperance so I'm not sure if it's true. I do know I put one on my bow. He used it all that fall and killed 2 doe's with it on a IRQOUIS 58" long bow.