Bowhunting (or bow hunting) is the practice of hunting game animals by archery. Many indigenous peoples have employed the technique as their primary hunting method for thousands of years, and it has survived into contemporary use for sport and hunting. Arrows, bows and sights are commonly of the more modern varieties. However, all effective variations, including crossbows and wooden bows launching wooden arrows with stone points, are used. Arrowheads are chosen to ensure lethality. Broadheads feature blades that jut out from the shaft at an angle to cause more damage to the target; some models have retractable blades that only deploy once they hit the target.