Un orso dello Zoo di Billings, Montana, USA

In this photo provided by provided by ZooMontana, one of the female grizzly bear cubs who’s mother killed one person and mauled two others in a late-night attack at a Montana campground bears is shown on Aug. 1, 2010 at ZooMontana in Billings, Mont. 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.

(AP Photo/ZooMontana)