"Gardiner, Mont. -- Wolf 527 was a survivor. She lived through a rival pack's crippling 12-day siege of her den. When another pair of wolves laid down stakes in her territory, she killed the mother and picked off the pups while the invader's mate howled nearby in frustration and fury.
She was not a charmer. But successful wolves are not known for their geniality. She was large and black and wary -- and cruel when she needed to be. As the alpha female of the Cottonwood Creek pack, she also was equipped with a radio collar so wildlife biologists could track her movements, making her one of Yellowstone National Park's best-known wolves.
Then she ventured outside the park boundaries."