https://www.researchgate.net/publication/229958565_Great_white_shark_teeth_used_as_pendants_and_possible_tools_by_Early-Middle_Holocene_terrestrial_mammal_hunter-gatherers_in_the_Eastern_Pampas_Southern_South_America

Some wild llama hunters made tools from serrated sharks teeth

The root tips of the shark teeth are marked by an artificial transvers groove fitted to tie a thread. Tooth edge serrations are strongly eroded, suggesting they were used as tools.

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