Question: what is the unique property of an arrowhead

title: Arrowhead
text: These hafted points might have been launched from bows . While `` most attributes such as micro-residue distribution patterns and micro-wear will develop similarly on points used to tip spears , darts or arrows '' and `` explicit tests for distinctions between thrown spears and projected arrows have not yet been conducted '' the researchers find `` contextual support '' for the use of these points on arrows : a broad range of animals were hunted , with an emphasis on taxa that prefer closed forested niches , including fast moving , terrestrial and arboreal animals . This is an argument for the use of traps , perhaps including snares . If snares were used , the use of cords and knots which would also have been adequate for the production of bows is implied . The employment of snares also demonstrates a practical understanding of the latent energy stored in bent branches , the main principle of bow construction . Cords and knots are implied by use - wear facets on perforated shell beads around 72,000 years old from Blombos . Archeologists in Louisiana have discovered that early Native Americans used Alligator gar scales as arrow heads .