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ponds.They're especially productive in Voyageurs.Although the tracked wolves ate plenty of beavers-some packs killed 40% of them in their territories each year-they didn't have a major impact on long-term beaver numbers,the researchers found. But the wolves did influence where their prey (lived In particular,wolves frequently ate "dispersing"beavers that had left their home to colonize new areas.These beavers were in great danger because they had to repeatedly risk their life onto land to harvest sticks for their new dams.After wolves killed these colonists,the researchers found their partial ponds re- mained unoccupied for the rest of the year.So the hunters pre vented forests from fully changing to ponds and wetlands-pre venting dramatic environmental change.