2021 Known and Probable Grizzly Bear Mortalities in the Greater Yellowstone Ecosystem

This information is preliminary and is subject to revision. It is being provided to meet the need for timely best science. The information is provided on the condition that neither the U.S. Geological Survey nor the U.S. Government shall be held liable for any damages resulting from the authorized or unauthorized use of the information. Release of information will be limited for mortalities under investigation.
Updated mortality tables now located on Interagency Grizzly Bear Team (IGBST) main page under "Grizzly Bear Mortality Information" section       
Link to IGBST page       
        
        
        
2021 Known and Probable Grizzly Bear Mortalities in the Greater Yellowstone Ecosystem       
        
This information is preliminary and is subject to revision. It is being provided to meet the need for timely best science. The information is provided on the condition that neither the U.S. Geological Survey       
nor the U.S. Government shall be held liable for any damages resulting from the authorized or unauthorized use of the information. Release of information will be limited for mortalities under investigation.       
        
CountUniqueSexAge classKnown Mortality DateLocationDemographic Monitoring AreaLoss
        
Part A. Documented known and probable grizzly bear mortalities that occurred during 2021 inside the Demographic Monitoring Area (DMA).       
        
1202101FSubadult4/6/2021South Fork Shoshone River, PR-WYInsideKnown, human-caused, management capture and removal (humane) of an unmarked subadult in poor condition that was frequenting vicinity of ranch buildings.
2202102  2021IDInsideKnown, under investigation.
3202103  2021IDInsideKnown, under investigation.
4202104  2021MTInsideKnown, under investigation.
5202111FCub5/20/2021Grinnell Crk, SNF-WYInsideKnown, natural, cub killed by another bear.
6202112MSubadult5/22/2021Snake River, PR-WYInsideKnown, human-caused, management capture and removal for repeated property damage, habituated behavior, and obtaining food rewards in residential areas.
7202115MSubadult6/5/2021Grinnell Crk, SNF-WYInsideKnown, human-caused, management capture and removal for repeated bold behavior and guest lodges and trailheads.
8202116MAdult6/4/2021Gallatin River, YNPInsideKnown, human-caused, vechile strike on HW191.
9202117MAdult6/4/2021Yellowstone River, PR-MTInsideKnown, natural, old age bear, likely drowned, no evidence of human causes, location is where carcass was found.
10202118  2021MTInsideKnown, under investigation.
        
        
Part B. Documented known and probable grizzly bear mortalities that occurred during 2021 outside the Demographic Monitoring Area (DMA).       
        
1202106FSubadult5/5/2021Gooseberry Crk, PR-WYOutsideKnown, human-caused, management capture and removal for cattle depredations.
2202107MSubadult5/5/2021Gooseberry Crk, PR-WYOutsideKnown, human-caused, management capture and removal for cattle depredations.
3202108MAdult5/11/2021Carbon County, PR-MTOutsideKnown, human-caused, management capture and removal for cattle depredations.
4202109MYearling5/20/2021Heart Mountain Canal, PR-WYOutsideKnown, human-caused, drowned in cement sided canal.
5202110MYearling5/20/2021Heart Mountain Canal, PR-WYOutsideKnown, human-caused, drowned in cement sided canal.
6202114FAdult5/20/2021Heart Mountain Canal, PR-WYOutsideKnown, human-caused, drowned in cement sided canal.
        
        
Part C. Documented known and probable grizzly bear mortalities found during 2021 that occurred in years prior to 2021.       
        
1202105  2020WYInsideKnown, under investigation.
2202113MAdultSpring 2020Soda Butte Crk, YNPInsideKnown, undetermined cause, remains of an old adult male found by park visitor, bears was estimated to have died spring of 2020.
        
Known mortality - a carcass is in hand; Probable mortality - evidence strongly suggests a mortality has occurred but no carcass is recovered. Abbreviations: BOR = Bureau of Reclamation;       
BLM = Bureau of Land Management; BTNF = Bridger-Teton National Forest; COY = cub-of-the-year; CTNF = Caribou-Targhee National Forest; GNF = Gallatin National Forest;       
GTNP = Grand Teton National Park; IDFG = Idaho Fish and Game; MTFWP = Montana Fish, Wildlife and Parks; PR = private land; ST= state owned land; SNF = Shoshone National Forest;       
UNK = Unknown; WRIR = Wind River Indian Reservation; WYGF = Wyoming Game and Fish; YNP = Yellowstone National Park.       
Known mortality - a carcass is in hand; Probable mortality - evidence strongly suggests a mortality has occurred but no carcass is recovered. Abbreviations: BOR = Bureau of Reclamation; BLM = Bureau of Land Management; BTNF = Bridger-Teton National Forest; COY = cub-of-the-year; CTNF = Caribou-Targhee National Forest; GNF = Gallatin National Forest; GTNP = Grand Teton National Park; IDFG = Idaho Fish and Game; MTFWP = Montana Fish, Wildlife and Parks; PR = private land; ST= state owned land; SNF = Shoshone National Forest; UNK = Unknown; WRIR = Wind River Indian Reservation; WYGF = Wyoming Game and Fish; YNP = Yellowstone National Park.