 His patrols kept him in the wilderness for months on end.He routinely spent each day from dawn to dusk following bears, documenting their feeding, mating, and social habits.He compiled one of the most exhaustive documentaries on the giant, cousins of the North American grizzly bear, Kamchatka brown bears, regularly filling what became hundreds of journals, a body of work viewed as one of the most important biographical records of brown bear behaviour in existence.