2018 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 2018 inside the Demographic Monitoring Area (DMA).         
          
1201803MAdult5/8/2018Clarks Fork Yellowstone, SNF-WYInsideKnown, human-caused, humane removal of old bear in very poor condition that was unable to lift hind legs.  
2201804MAdult5/9/2018Green Crk, PR-WYInsideKnown, human-caused, management capture and removal for breaking into a building and obtaining a food reward.  
3201808  2018WYInsideKnown. Under investigation.  
4201809  2018WYInsideProbable. Under investigation.  
5201810  2018WYInsideProbable. Under investigation.  
6201811  2018WYInsideProbable. Under investigation.  
7201814  2018WYInsideKnown. Under investigation.  
8201815  2018WYInsideProbable. Under investigation.  
9201816  2018WYInsideProbable. Under investigation.  
10201820MAdult7/8/2018Crow Crk, BTNF-WYInsideKnown, human-caused, management capture and removal for cattle depredations.  
11201821MAdult7/13/2018Wagon Crk, BTNF-WYInsideKnown, human-caused, management capture and removal for cattle depredations.  
12201822MAdult7/13/2018Mosquito Lake, BTNF-WYInsideKnown, human-caused, management capture and removal for cattle depredations.  
13201823MSubadult7/20/2018Mill Crk, CTNF-IDInsideKnown, human-caused, management removal for bold behavior and obtaining unsecured anthropogenic food reward.  
14201824FSubadult5/15/2018Coulter Crk, BTNF-WYInsideKnown, natural, likely killed by another bear.  
15201825FAdult7/25/2018Gypsum Crk, BTNF-WYInsideKnown, human-caused, management removal for multiple cattle depredations.  
16201826UnkAdult7/19/2018Yellowstone River, BTNF-WYInsideKnown, natural, killed and consumed by another bear(s).  
17201827MAdult8/1/2018Gypsum Crk, BTNF-WYInsideKnown, human-caused, management capture and removal for cattle depredations.  
18201828MAdult8/5/2018Gypsum Crk, BTNF-WYInsideKnown, human-caused, management capture and removal for cattle depredations.  
19201831  2018MTInsideUnder investigation.  
20201832MAdult8/13/2018Wagon Crk, BTNF-WYInsideKnown, human-caused, management capture and removal for cattle depredations.  
21201834MYearling8/14/2018Henrys Fork, PR-IDInsideKnown, human-caused, management live removal for bold behavior towards humans at campgrounds and obtaining anthropogenic food rewards at numerous residences.  
22201835MAdult8/30/2018Reader Crk, PR-MTInsideKnown, human-caused, management capture and removal for cattle depredations.  
23201838MAdult9/3/2018North Fork Shoshone, PR-WYInsideKnown, human-caused, management capture and removal for property damage and livestock depredations.  
24201840MSubadult9/6/2018Fish Crk, BTNF-WYInsideKnown, human-caused, management capture and removal for cattle depredations.  
25201842MSubadult9/6/2018North Fork Shoshone, SNF-WYInsideKnown, human-caused, vehicle collision.  
26201843FAdult9/16/2018Soda Fork, BTNF-WYInsideKnown, human-caused, management capture and removal for public safety of female with a male yearling involved in human fatality.  
27201844MYearling9/16/2018Soda Fork, BTNF-WYInsideKnown, human-caused, management capture and removal for public safety of male yearling involved in human fatality.   
28201845MAdult9/10/2018Russell Crk, SNF-WYInsideKnown, natural, specific mechanism was likely infected injury in the groin area not thought to be human-caused.  
29201846FAdult9/6/2018South Fork Wood River, SNF-WYInsideKnown, natural, evidence suggest bear was killed and consumed at site of a deer carcass.  
30201848MAdult9/21/2018North Fork Shoshone, PR-WYInsideKnown, human-caused, management capture and removal for obtaining anthropogenic food rewards at numerous residences, property damage and poultry depredation.  
31201849MAdult9/25/2018Corral Crk, SNF-WYInsideKnown, human-caused, management capture and removal for obtaining anthropogenic food rewards and prior conflict history.  
32201850  2018MTInsideProbable. Under investigation.  
33201852  2018WYInsideKnown. Under investigation.  
34201854  2018WYInsideKnown. Under investigation.  
35201855  2018WYInsideKnown. Under investigation.  
36201856FAdult10/3/2018Whit Crk, PR-WYInsideKnown, human-caused, management capture and removal of female with 2 yearling for obtaining anthropogenic foods and increasingly habituated and bold behavior.  
37201857MYearling10/3/2018Whit Crk, PR-WYInsideKnown, human-caused, management capture and removal of yearling with mother and sibling for obtaining anthropogenic foods and increasingly habituated and bold behavior.  
38201858MYearling10/3/2018Whit Crk, PR-WYInsideKnown, human-caused, management capture and removal of yearling with mother and sibling for obtaining anthropogenic foods and increasingly habituated and bold behavior.  
39201859  2018WYInsideKnown. Under investigation.  
40201860  2018WYInsideProbable. Under investigation.  
41201861  2018WYInsideProbable. Under investigation.  
42201862FSubadult10/4/2018Yellowstone River, PR-MTInsideKnown, human-caused, management capture and removal for frequenting residences, habituated behavior, and public safety concerns.  
43201863  2018WYInsideKnown. Under investigation.  
44201864FSubadult10/16/2018Yellowstone River, PR-MTInsideKnown, human-caused, management capture and removal for frequenting residences, habituated behavior, and public safety concerns.  
45201865FAdult10/19/2018Corral Crk, SNF-WYInsideKnown, human-caused, management capture and removal of bear for property damage, obtaining food rewards, and frequenting developed areas.  
46201865MAdult10/19/2018Reef Crk, SNF-WYInsideKnown, human-caused, vehicle collision.  
          
Part B. Documented known and probable grizzly bear mortalities that occurred during 2018 outside the Demographic Monitoring Area (DMA).         
          
1201801MAdult4/10/2018Rawhide Crk, PR-WYOutsideKnown, human-caused, management capture and removal frequenting calving area and history of livestock depredations.  
2201802MAdult4/29/2018Pat O'Hara Crk, PR-WYOutsideKnown, human-caused, management capture and removal frequenting calving area and bold behavior towards humans.  
3201813FSubadult5/30/2018Blaine Crk, BLM-WYOutsideKnown, human-caused, management removal for association with multiple livestock conflicts bold behavior towards humans.  
4201817MAdult6/17/2018Alkali Crk/Heart Mountain Canal, PR-WYOutsideKnown, human-caused, accidental, drowned in fast flowing, cement sided canal.  
5201818MAdult6/22/2018Bull Crk, BLM-WYOutsideKnown, human-caused, management capture for cattle damage, removed because of poor condition and extensive injuries from unknown cause.  
6201819MAdult6/22/2018Foster Gulch, PR-MTOutsideKnown, human-caused, management capture and removal for cattle depredations.  
7201829MAdult8/4/2018Paint Crk, PR-WYOutsideKnown, human-caused, management capture and removal for cattle depredations.  
8201833FAdult8/9/2018JK Crk, WRIROutsideKnown, human-caused, management capture and removal for cattle depredations.  
9201836MSubadult9/1/2018South Fork Shoshone, PR-WYOutsideKnown, human-caused, management capture and removal for repeated nuisance activity at residences and property damage.  
10201837  2018WYOutsideKnown. Under investigation.  
11201839MAdult9/4/2018South Fork Owl Crk, PR-WYOutsideKnown, human-caused, management capture and removal for cattle depredations.  
12201841FCub9/6/2018Paint Crk, PR-WYOutsideKnown, human-caused, handling mortality. Management capture with mother and siblings for cattle depredations.  
13201847FAdult9/20/2018Clarks Fork Yellowstone, PR-WYOutsideKnown, human-caused, management capture and removal for frequenting agricultural area and public corn maze.  
14201851MYearling9/30/2018Clarks Fork Yellowstone, PR-WYOutsideKnown, human-caused, management capture and removal for frequenting agricultural area and public corn maze.  
15201853MSubadult10/2/2018Clarks Fork Yellowstone, PR-WYOutsideKnown, human-caused, management capture and removal for frequenting agricultural area and public corn maze.  
16201867FAdult10/25/2018Shoshone River, PR-WYOutsideKnown, human-caused, management capture and removal of female with 2 cubs for previous conflicts and public satety concerns.  
17201868MCub10/25/2018Shoshone River, PR-WYOutsideKnown, human-caused, management capture and removal of cub with mother and sibling for previous conflicts and public satety concerns.  
18201869FCub10/25/2018Shoshone River, PR-WYOutsideKnown, human-caused, management capture and removal of cub with mother and sibling for previous conflicts and public satety concerns.  
          
Part C. Documented known and probable grizzly bear mortalities found during 2018 that occurred in years prior to 2018.         
          
1201805FAdultFall, 2017MTInsideKnown, undetermined cause, mortality likely occurred fall 2017, was found spring 2018. Under investigation.  
2201806UnkCubFall, 2017MTInsideProbable, undetermined cause, cub of female that died fall 2017 and was found spring of 2018. Under investigation.  
3201807UnkCubFall, 2017MTInsideProbable, undetermined cause, cub of female that died fall 2017 and was found spring of 2018. Under investigation.  
4201812UnkAdultFall, 2017Crevice Crk, YNPInsideKnown, undetermined cause, bear remains found that had been cached and consumed by another bear, likely natural mortality from fall of 2017.  
5201830MAdult2016Buffalo Fork, BTNFInsideKnown, undetermined cause, skeletal remains found including skull. Skull characteristics indicated likely adult male. Estimated to have died in 2016.   
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.