Montana bear expert, advocate Chuck Jonkel dies at 85

This undated photo provided by the Great Bear Foundation shows Chuck Jonkel, teaching students how to build an igloo in Churchill, Mont. Pioneering bear researcher and advocate Charles "Chuck" Jonkel died Tuesday, April 12, 2016, of natural causes at a Missoula, Mont., nursing home, his son Jamie Jonkel said. He was 85. Jonkel led the Border Grizzly Project shortly after the bears were placed under the protection of the Endangered Species Act in 1975. (Frank Tyro/Great Bear Foundation via AP)