prey

Narwhals increasingly exposed to mercury

May 7, 2021

Narwhal tusks can tell researchers a lot about the marine mammals’ feeding habits and exposure to dangerous chemicals. “They’re kind of like tree rings,” ...

Wolves alter Minnesota wetlands

December 4, 2020

Wolves in Minnesota’s Voyageurs National Park are changing the wetlands ecosystem there, researchers found, due to their appetite for beavers. “Wolves eat a lot ...
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