JACKSON, Wyo. (AP) — The timeline on the proposed delisting of the grizzly bear in the Greater Yellowstone Ecosystem remains unclear for now.

Jodi Bush is the supervisor of the U.S. Fish and Wildlife Service's Montana Ecological Field Office.

Bush says the timeline for publishing the final rule for delisting the grizzly is unclear in part because of the transition of presidential administrations and reviews at the Fish and Wildlife Service.

Fish and Wildlife first issued a proposal to delist Yellowstone-area grizzlies in spring 2016.

Grizzlies in the Greater Yellowstone Ecosystem have been managed under the protective rules of the Endangered Species Act since 1975, with the exception of a two-year hiatus in the late 2000s.