From about 2006 to 2013, the moose population in northeastern Minnesota dropped dramatically, from almost 9,000 animals to about 2,700. And no one knew why.

Dr. Seth Moore began searching for answers, working with a team at the Grand Portage Trust Lands Agency. They started collaring moose, tracking them to find their killers. And they discovered that among all predators, one loomed largest.

Researchers hope as more people learn about moose, they'll be motivated to protect them — before it's too late.

Video of moose suffering from brainworm: https://youtu.be/-_MxDcY_osw

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