○○○keystone species⪢⪢
Beavers are keystone species wielding an oversized influence on their surroundings. They build dams which filter water, flood rivers and create crucial wetlands.
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http://qindex.info/i.php?x=14911
○○○piggyback⪢⪢
Flooded for months at a time, the wetlands are home to swarms of young creatures like the ugly ducklings, piggyback chicks and builders busy grooming themselves.
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http://qindex.info/i.php?x=19465