Bill Watkins , spelled this out quite well, Cause and effect, Bill I began working in Denali about the same time ( 25 yrs ago ), ere once was approx.; 150 Wolves then . Sightings of Many wolves every week was common. I averaged 5 weekly, most times several @ a time. Now there R less than 50, @ a recent  NPS Ranger program here , the speaker claimed> 20 wolf groups here , Wrong!!!,  A lot less, say maybe 9.