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Scientists Have Discovered The Oldest Fossil Footprints ( 551m -541m Yrs Old) In The World, In South China. The Footprints Is Said To Belong To An Unknown Creature, Which Scientists Suspect Could Be A Primitive Ancestor To Modern Day Insects or Worms. Identifying The Creature Could Inform On How Animals Began Changing The Earth. Cool!

540m-year-old bug tracks are oldest footprints ever discovered | Science | The Guardian

https://www.theguardian.com/science/2018/jun/06/oldest-known-footprints-on-earth-discovered-left-by-ancient-bug

Ancient prints bring scientists closer to understanding what were the first creatures to evolve pairs of legs