The Unusual Weapon Yellowstone Is Using To Combat Invasive Species

Zebra and quagga mussels can devastate an ecosystem, and Yellowstone National Park is doing everything it can to keep them out. Most recently, that includes harnessing the power of a dog's snout.

On a July morning at Grant Village Visitor Center, Barley the border collie was really in his element.

"Barley and Tobias and I are looking for zebra and quagga mussels," said dog handler, Kayla Fratt.

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