Leeches expose wildlife’s whereabouts and may aid conservation efforts
DNA extracted from the parasitic worms’ blood meals lets scientists track where animals roam
![photo of a brown leech on a leaf](https://i0.wp.com/www.sciencenews.org/wp-content/uploads/2022/04/040522_no_leech-dna_feat.jpg?fit=1030%2C580&ssl=1)
Ecologists are using bloodthirsty leeches to evaluate the success of wildlife conservation efforts in China.
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