How are the events from frank craighead’s life presented in the text?

Frank Craighead, who with his identical twin, John, performed a 12-year study of grizzly bears in and around Yellowstone National Park that was credited with helping save the species from extinction in the lower 48 states, died on Oct. 21 at a nursing home in Jackson, Wyo. He was 85.

Mr. Craighead lived in a log cabin near Moose, Wyo., where black bears camped on the porch, elk and antelope played nearby and grizzlies were within growling distance.

The brothers were the first to use radio collars to track large mammals, a technique that opened new windows into grizzlies' habits. For the first time, their dens could be found, and the Craigheads burrowed right in with them.