I got into a conversation with a fellow fly fisherman and fly tier on where calf tail comes from (I'm referring to the commercial calf tail that is specifically for fly tying purposes). Where do the pieces of calf tail come from? Stillborn calves, regular calves that go the the slaughter house, etc....? When he asked I wasn't sure where this staple fly tying material comes from really. Can anybody shed some light on where calf tail comes from for fly tying purposes? Where do the fly tying material companies get their calf tail? etc.