Wolf Cubs' Death Rate Worrisome, Officials Say ; Yellowstone Experts Suspect Dog Disease

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BILLINGS, Mont. - Most of the gray wolf pups born in Yellowstone National Park last year have died, possibly because of a dog disease, a federal wolf expert says.

Just 22 of the 69 pups born last year are still alive, said Doug Smith, the park's wolf project leader. That's the biggest drop in pup numbers since wolves were reintroduced to the park 11 years ago. The greatest toll was seen on the park's northern range, where only eight of the 49 pups born last spring survived.

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Wolf Cubs' Death Rate Worrisome, Officials Say ; Yellowstone Experts Suspect Dog Disease

"It's cause for concern, a great deal of concern," Smith said.

During the next few weeks, he said, offi...

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