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Post by Deleted on Feb 25, 2019 3:10:33 GMT -5
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Post by King Kodiak on Mar 2, 2019 10:54:50 GMT -5
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Post by brobear on Mar 21, 2019 5:58:15 GMT -5
American black bears have few predators.
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Post by King Kodiak on Sept 1, 2019 18:54:47 GMT -5
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Post by King Kodiak on Apr 1, 2020 19:02:34 GMT -5
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Post by theundertaker45 on Apr 14, 2020 9:10:42 GMT -5
Everyone here has probably heard of the infamous incident when a grizzly bear predated on an American black bear in Hayden Valley, Yellowstone National Park. I will just share the report and the full PDF here so that it is easily accessible. It should be noted that the grizzly bear killed the black bear by crushing his skull; I personally was very surprised by that and it proves that a grizzly bear's jaws indeed have enough power to crush the skull of a 200lbs+ black bear which surely is an impressive feat. Both grizzly and black bears live in Yellowstone National Park. In this and other areas where grizzly bears and black bears are sympatric (share habitat), temporal isolation and behavioral differences tend to reduce direct competition between the two species. In the Greater Yellowstone Ecosystem, grizzly bears are generally most active from dusk until dawn, while black bears are most active during the daytime. Grizzly bears evolved to forage in open meadow habitats, whereas black bears are primarily adapted to living in forests. Grizzlies also have longer claws and larger shoulder musculature than black bears, making them more efficient at foraging roots and grounddwelling small mammals abundant in open meadows. Grizzlies are generally larger than black bears, and are much more aggressive in defending themselves and their offspring from predators, including other grizzlies. Black bears typically escape predators by running into forest cover or climbing trees.
On August 2, 1998, park visitors looking for grizzly bears from Grizzly Overlook in Hayden Valley observed some ravens on a carcass on the northeast side of the Yellowstone River. Upon focusing their spotting scope on the carcass, they could clearly see the partially consumed remains of a black bear in the tall grass next to the river. The visitors reported the presence of the carcass to Canyon area rangers, who immediately forwarded the report to the park’s Bear Management Office. We received permission from the rangers to canoe across the Yellowstone River to examine and retrieve the carcass. Accompanied by biological technician Christie Hendrix and park ranger Keith Gad, we canoed across the river to the carcass. Although the dead bear was not visible to motorists along the road, a large number of park visitors immediately pulled over to watch as we launched the canoe, creating a large canoe-jam. We paddled downstream and across the river and pulled the canoe up onto the bank next to the black bear’s carcass to examine it. The carcass was that of an adult male weighing (minus the eaten tissue) 171 pounds. Prior to being consumed, the bear had likely weighed over 200 pounds.
The bear had canine puncture wounds to the head and nose, as well as a crushed skull and left eye socket. The wounds were consistent with those that would have been inflicted by a bear or other large predator. When fighting, bears will often bite each other on the nose in an effort to neutralize their opponents’weapons (teeth). We also found two bear scats containing vegetation next to the carcass. The predator that had killed and partially consumed the black bear had likely defecated these scats while feeding on its carcass. We collected the scats for DNA analysis to aid in determining the species of the predator that had killed the black bear, then loaded the carcass and two scats into the canoe and ferried upstream back across the river to the large aggregation of people that had congregated to watch. After letting the visitors see the bear, and explaining possible scenarios of what may have happened, we loaded the carcass into our truck, covered it with a tarp, and headed back to Mammoth. We took the bear’s carcass to Neil Anderson at the Montana Fish, Wildlife and Parks Wildlife Laboratory in Bozeman, Montana, for necropsy.
Neil was able to measure one set of canine puncture marks he believed were caused by the lower canines of the predator that killed the black bear. The center-to-center distance of these canine puncture marks measured 59 mm, too large to have been from an adult wolf, mountain lion, or averagesized black bear. Measurements taken from reference skulls show that canine widths in that range are typical of average size, adult male grizzly bears in the GYE, although we could not completely rule out a very large adult male black bear as the predator. The identification of the predator that killed the black bear as a grizzly (based on the canine width of wounds found on the black bear’s head) was later supported through laboratory analysis of DNA extracted from the bear scats collected at the kill site. We sent the scats to Dr. Lisette Waits at the University of Idaho for analysis, and DNA extracted from the scats indicated that they were, in fact, from a grizzly bear. When threatened, black bears typically run to forest cover or climb a tree. In this case, the nearest climbable tree to the site where the black bear was killed was a single dead snag on a small island in the middle of the Yellowstone River over 70 meters away. The nearest climbable live trees were approximately 130 meters away on the opposite shore from the bank where the black bear was killed. The nearest climbable trees that could be reached without swimming were almost 1,000 meters northeast of the kill site. This observation lends insight into what can happen to black bears that wander too far from forest cover in areas occupied by grizzly bears, and why we rarely see black bears in the large,non-forested areas of YNP such as Pelican and Hayden Valleys,where grizzly bears are common.
Grizzly bear predating on American black bear.pdf (111.15 KB)
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Post by OldGreenGrolar on Apr 16, 2020 17:48:18 GMT -5
That’s not a surprise to me. American black bears are sturdy powerful animals. Therefore, killing one shows the strength of a grizzly bear.
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Post by brobear on Apr 24, 2020 8:24:46 GMT -5
Another epic showdown featuring an American black bear and a Yellowstone grizzly bear.
Yellowstone grizzly vs American black bear from east of the Mississippi.
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Post by tom on Apr 24, 2020 14:49:36 GMT -5
Grizzly no contest IMO. A Grizzly would win 9/10 times over any Black Bear. Possibly 10/10.
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Post by OldGreenGrolar on Sept 17, 2020 5:39:04 GMT -5
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Post by brobear on Mar 28, 2021 2:19:51 GMT -5
Grizzly going after black bear cubs.
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Post by OldGreenGrolar on Mar 28, 2021 6:06:00 GMT -5
The only animal an American black bear actually fears is the grizzly bear.
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Post by brobear on Apr 22, 2021 3:58:12 GMT -5
Maximum Dimensions: Not every tiger is an Amur or a Bengal. Also consider that the American black bear is probably the most underrated bear of all. At max, this bear weighs between 600 and 800 pounds.
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Post by brobear on Apr 22, 2021 4:30:05 GMT -5
I would wager on an American black bear ( normal max from 600 to 800 pounds ) against a lion or a tiger. Average-size black bear is too small.
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Post by OldGreenGrolar on May 8, 2021 8:26:46 GMT -5
I would wager on an American black bear ( normal max from 600 to 800 pounds ) against a lion or a tiger. Average-size black bear is too small. I agree with you. In addition 500 to 600 pound American black bears are way more common than male polar bears 1400 pounds and above.
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Post by OldGreenGrolar on May 8, 2021 8:28:25 GMT -5
American black bears have few predators. Their only predator today is the grizzly bear. During the Pleistocene age, Sabre toothed cats and American lions were probably included too.
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Post by brobear on May 9, 2021 11:38:00 GMT -5
American black bears have few predators. Their only predator today is the grizzly bear. During the Pleistocene age, Sabre toothed cats and American lions were probably included too. The Pleistocene black bear was in the size-range of todays inland grizzly ( av. 400 to 500 pounds ). They were in competition with Florida short-faced bears. This does not necessarily mean fighting. Who can best take advantage of food availability. Both were omnivores leaning more towards vegetation than meat. Perhaps the black bear had a few advantages. Was the Florida short-faced bear a tree-climber? If not, he was more prone to be killed by large predators. Did the Florida short-faced bear hibernate? Probably not. Predators of black bears would include; lions, saber-toothed cats, jaguars, giant short-faced bears, wolves, dire wolves, and the grizzly.
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Post by brobear on Feb 7, 2023 8:00:11 GMT -5
qwaszx
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