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Explaining Minnesota's dwindling moose population

A moose calf follows its mother
In this 2014 photo provided by the Minnesota Department of Natural Resources, a moose calf follows its mother in the snow near Grand Marais, Minn.
Pete Takash | Minnesota DNR file via AP

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Minnesota's moose population has fallen significantly since the mid-2000s.

So far, researchers have been puzzled by the declines, pointing to several factors that could be negatively influencing moose health.

Trevor Vannatta, a graduate student at the University of Minnesota-Duluth, is researching one of those possibilities. He joined Tom Weber to discuss his work.