• Crabs feed on black turban snails, but failed attacks will leave scars on a snail’s shell.
  • Researchers have found that by analyzing the rate of scarring and the size of the snail when it was attacked, they can learn a lot about the population numbers of the crabs.
  • They founds that comparing the number of scars on modern snails with those from the fossil record, they can date the comparison back up to 120 000 years.


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