Cheyenne, WY – Sage grouse numbers across the West have gradually increased in recent years. That's according to a 700 page report released by a group of state wildlife managers. The team also included a representative of the Wyoming Game and Fish Department. The study charts a drastic decline in sage grouse across the west from the 1960's to the mid-1980's, a slower decline in the '90's and a gradual increase in recent years. The documents also outlines natural and human effects on sage grouse such as habitat fragmentation, energy exploration and cheat grass invasion, which promotes grass fires. The study is available on the Wyoming Game and Fish Department website.