AP Photo/Montana Fish, Wildlife and Parks DepartmeThis image provided by the Montana Fish, Wildlife and Parks Department on Friday July 30, 2010, shows a captured grizzly sow believed to be responsible for the mauling death of one camper and injuring two others near Yellowstone National Park in Montana. The fate of the bear will be determined after DNA tests confirm whether it was responsible for the attacks.
BILLINGS, Mont. - Three grizzly bear cubs whose mother killed one person and mauled two others in a late-night attack at a Montana campground were malnourished and still in their winter coats.
The cubs have arrived at their new home at ZooMontana in Billings. Zoo executive director Jackie Worstell said Sunday the two female cubs and one male cub were underweight, possibly explaining their mother's unusually aggressive behavior.
"It may be an indication of what happened," Worstell said. "There's obvious signs of stress and malnourishment. Maybe (the sow) was desperate."
The year-old cubs each weighed only between 60 and 70 pounds, versus a normal range of 80 to 130 pounds. Wildlife officials are investigating what caused the cubs to be malnourished. Grizzlies are omnivores and eat everything from berries and ants to fish and elk.
Kevin Kammer, 48, of Grand Rapids, Mich., was killed and two people were seriously injured when the adult bear ripped into several tents Wednesday at the Soda Creek Campground near Cooke City, an old mining town just outside Yellowstone National Park.
The 300- to 400-pound sow was euthanized Friday after DNA tests linked it to the attacks. Wildlife officials have said she appeared to be healthy, but they intend to further study the body in hopes of explaining her behavior.
Worstell said the cubs will remain in quarantine for at least 30 days to make sure they are disease-free.
The zoo has one other grizzly, a year-old male obtained from Yellowstone National Park that had been seeking food from park visitors. The zoo also has a 10-year-old Eurasian brown bear.
The three cubs aren't expected to be available for public viewing until fall.
Wildlife officials say the cubs likely participated in the attack on Kammer, and so cannot be released back into the wild having probably learned from their mother's behavior.