2020 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 2020 inside the Demographic Monitoring Area (DMA).       
        
1202002MAdult4/29/2020Snake River, PR-WYInsideKnown, human-caused, management removal for obtaining numerous food rewards, property damage, and entering structures.
2202003MAdult5/5/2020North Fork Shoshone, PR-WYInsideKnown, human-caused, management removal for repeat offenses in developed areas, property damage, and poultry depredations.
3202011FSubadult6/18/2020Ghost Crk, SNF-WYInsideKnown, human-caused, management removal for bold and aggressive behavior towards people.
4202014MAdult7/3/2020Fence Crk, BTNF-WYInsideKnown, human-caused, management removal for cattle depredations.
5202015MAdult7/3/2020Grayling Arm-Hegben Lake, CGNF-MTInsideKnown, human-caused, management live removal for obtaining multiple food rewards and nuisance behavior at a campground and private residences.
6202018MAdult7/30/2020Wagon Crk, BTNF-WYInsideKnown, human-caused, management removal for cattle depredations and poor condition of very old bear.
7202019MAdult7/30/2020Park County, PR-MTInsideKnown, human-caused, management removal for cattle depredations.
8202021MSubadult8/7/2020Eagle Crk, SNF-WYInsideKnown, human-caused, management removal for nuisance activity, habituated behavior, and obtaining multiple food reward at multiple sites.
9202025FSubadult9/1/2020Denny Crk, PR-MTInsideKnown, human-caused, management capture and removal for property damage and obtaining food rewards at multiple residences.
10202026MSubadult9/1/2020Denny Crk, PR-MTInsideKnown, human-caused, management capture and removal for property damage and obtaining food rewards at multiple residences.
11202028  2020WYInsideKnown, Under investigation.
12202029  2020MTInsideKnown, Under investigation.
13202030MAdult9/24/2020Timber Crk, PR-WYInsideKnown, human-caused, management capture and removal obtaining food rewards at multiple locations.
14202031  2020MTInsideKnown, Under investigation.
15202032MSubadult9/26/2020Trout Crk, PR-WYInsideKnown, human-caused, vehicle strike on US highway 20.
16202034FSubadult9/26/2020Madison River, CGNF-MTInsideKnown, human-caused, vehicle strike on US highway 191.
17202035  2020WYInsideKnown, Under investigation.
18202036MSubadult9/29/2020South Fork Shoshone, PR-WYInsideKnown, human-caused, management capture and removal for obtaining multiple food rewards, aggressive behavior and nuisance activity at multiple residences.
19202037MAdult9/29/2020Green River, BTNF-WYInsideKnown, human-caused, management removal for cattle depredations.
20202038  2020IDInsideKnown, Under investigation.
21202039  2020MTInsideKnown, Under investigation.
22202041UCub10/8/2020Gallatin River, PR-MTInsideKnown, human-caused, vehicle strike on US highway 191.
23202042  2020WYInsideKnown, Under investigation.
24202043  2020WYInsideKnown, Under investigation.
25202044  2020WYInsideProbable, Under investigation.
26202046  2020MTInsideKnown, Under investigation.
27202047  2020MTInsideKnown, Under investigation.
28202049USubadult10/1/2020Devils Basin Crk, BTNF-WYInsideKnown, undetermined cause, remains found and reported by hunter, mortality date is approximate, DNA samples obtained for sex determination.
29202050  2020IDInsideKnown, Under investigation.
        
        
Part B. Documented known and probable grizzly bear mortalities that occurred during 2020 outside the Demographic Monitoring Area (DMA).       
        
1202001MSubadult4/25/2020Cottonwood Crk, BOR-WYOutsideKnown, human-caused, management removal for repeated conflicts in developed areas and failed attempts to haze bear away from developments.
2202004MSubadult5/7/2020Cottonwood Crk, PR-WYOutsideKnown, human-caused, vehicle strike on state highway WYO-120.
3202005MSubadult5/9/2020Cottonwood Crk, BOR-WYOutsideKnown, human-caused, management removal for frequenting developed areas near Cody.
4202006  2020WYOutsideKnown, Under investigation.
5202008MAdult6/7/2020Wolf Crk, PR-MTOutsideKnown, human-caused, management removal for cattle depredations.
6202009FAdult6/17/2020Carbon County, ST-MTOutsideKnown, human-caused, management removal for cattle depredations.
7202010MAdult6/17/2020South Fork Owl Crk, PR-WYOutsideKnown, human-caused, management removal for cattle depredations.
8202012MAdult6/19/2020Carbon County, PR-MTOutsideKnown, human-caused, management removal for cattle depredations.
9202013MSubadult6/20/2020South Fork Dry Crk, PR-WYOutsideKnown, human-caused, vehicle strike on state highway WYO-120.
10202016MSubadult7/12/2020Stillwater County, PR-MTOutsideKnown, human-caused, management removal for cattle depredations.
11202017FSubadult7/23/2020Carbon County, PR-MTOutsideKnown, human-caused, management removal for cattle depredations.
12202020FSubadult8/2/2020South Fork Shoshone, PR-WYOutsideKnown, human-caused, management removal for nuisance activity, habituated behavior, and obtaining multiple food reward private residences.
13202022  2020MTOutsideKnown, Under investigation.
14202023FAdult8/29/2020Blaine Crk, PR-WYOutsideKnown, human-caused, management removal for cattle depredations.
15202024FSubadult8/30/2020Blaine Crk, PR-WYOutsideKnown, human-caused, management removal for cattle depredations.
16202027MSubadult9/1/2020South Fork Owl Crk, PR-WYOutsideKnown, human-caused, management removal for sheep depredations.
17202033MSubadult9/26/2020Carbon County, PR-MTOutsideKnown, human-caused, management removal for cattle depredations.
18202045FSubadult10/19/2020Horse Crk, BLM-WYOutsideKnown, human-caused, management removal for habituated behavior and property damage.
19202048MAdult11/4/2020Pat O'Hara Crk, PR-WYOutsideKnown, human-caused, management removal for property damage and obtaining multiple food rewards.
        
        
Part C. Documented known and probable grizzly bear mortalities found during 2020 that occurred in years prior to 2020.       
        
1202007  2019WYInsideKnown. Under investigation.
2202040FAdultSummer/Fall 2019Trout Crk, YNPInsideKnown, undetermined cause, remains found by YNP staff, samples for DNA collected.
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.