Non-returning boomerangs have been used for at least 20,000-30,000 years, with the oldest known example carved from a mammoth's tusk. These non-returning boomerangs were used for hunting and were carved for straight flight and to stay in the air as long as possible when thrown correctly. The hunter was then able to throw the primitive boomerang great distances and hit an animal to be eaten for dinner. These animals were often small-game, but even the likes of kangaroo or emus can be sufficiently injured by a decently weighted boomerang such that the animal can no longer outrun the hunters.
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