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Post by Deleted on Dec 16, 2018 2:09:02 GMT -5
I would like to add something: the polar bear might have the weakest jaws pound to pound for of all bears but they have the best slicing bite and the sharpest teeth used to cut the hide of seals, walrus, and even small whales like beluga and narwhale.
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Post by brobear on Dec 16, 2018 5:18:46 GMT -5
I would like to add something: the polar bear might have the weakest jaws pound to pound for of all bears but they have the best slicing bite and the sharpest teeth used to cut the hide of seals, walrus, and even small whales like beluga and narwhale. As for the polar bear's bite. There are two opposing views there and both from reliable sources. Some claim he has the weakest bite of any bear with the exception of the sloth bear. Others claim he ranks high in bite force along with the sun bear and Andean bear - all below the panda bear. As measuring bite force is not an exact science, we simply need more data.
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Post by BruteStrength on Dec 17, 2018 22:34:00 GMT -5
Ok so basically no one knows how hard a polar bear can really bite?
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Post by brobear on Dec 30, 2018 6:07:25 GMT -5
shaggygod.proboards.com/ Evolutionary implications of bite mechanics and feeding ecology in bears Abstract Bite forces (BFs) based on a dry skull static model were computed for 122 specimens of all eight species of extant ursids. It was found that the giant panda has high BFs for its body size, and large moment arms about the temporomandibular joint, both muscle inlever moment arms and outlever moment arms to the carnassial and canine. The insectivorous sloth bear and to some extent the omnivorous black bears were the opposite. The small sun bear has very large canines and high BFs, which are not well understood, but could potentially be related to its frequent opening of tropical hardwood trees in pursuit of insects. Force profiles along the lower jaw revealed significant differences among the various species, both related to diet and inferred applied BFs. The panda is the only specialized ursid with respect to craniodental morphology and BFs, but is still unspecialized for herbivory compared with other large, herbivorous mammals, probably owing to a rather short evolutionary history, but possibly its morphology is constrained by genealogy. The low BFs in the sloth bear and its mandibular force profiles are derived for a diet of insects and fruit, requiring only low BFs and largely dorsoventral bite moments. In contrast, the unspecialized morphology and moderate BFs relative to body size of the polar bear and spectacled bear are probably also a result of a short evolutionary history. Subscription Link: onlinelibrary.wiley.com/doi/10.1111/j.1469-7998.2006.00286.x/abstract
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Post by brobear on Dec 30, 2018 6:09:28 GMT -5
shaggygod.proboards.com/ Text extract from Naturalist Terry Domico: "The brown bear is stout and rather chunky in shape, with a large hump of fat and muscle over the shoulders and very long claws. It has a wide, massive head that some people describe as being somewhat "dish faced" in appearance. That big head is equipped with extremely powerful jaws. I once saw a big male, trapped in a leg snare set by researchers, take out its frustration on some neighboring trees. In one bite he bit completely through a 4-inch (10-cm) -diameter pine, snapping it off. It also chewed through several 6- and 8-inch (15- and 20-cm) -diameter trees. One stump looked as though it had been dynamited. When we slammed the sharp end of a geologist's pick into the trunk of one of those trees, it only penetrated about 1.5 inches (3.8 cm) into the wood." Domico, T. and M. Newman. 1988. Bears of the world. Facts on File.
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Post by brobear on Dec 30, 2018 6:10:40 GMT -5
Measurement of a bear's bite force (depending on which specie of bear) is not an easy task. Some variables are difficult to quantify. There is anecdotal evidence of a bear's bite force strength as explained from the literature (see relating posts/threads) and similarly there are data provided in the form of popular media by bear specialists/biologist:
"Grizzly bears have a bite-force of over 8,000,000 pascals, enough to crush a bowling ball."
1 Pascal = 1 N/m2.
natgeotv.com/uk/casey-and-brutus-grizzly-encounters/facts
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Post by King Kodiak on Dec 30, 2018 10:57:06 GMT -5
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Post by brobear on Dec 30, 2018 13:48:47 GMT -5
I wonder if, pound-for-pound, his bite-force is greater even than the panda bear?
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Post by King Kodiak on Dec 30, 2018 13:57:14 GMT -5
I wonder if, pound-for-pound, his bite-force is greater even than the panda bear? Good question, we need more data.
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Post by brobear on Dec 30, 2018 21:45:08 GMT -5
I wonder if, pound-for-pound, his bite-force is greater even than the panda bear? Good question, we need more data. I know that pound-for-pound, the top three are the panda bear, sun bear, and Andean bear - but in what order? At actual size, the grizzly has the strongest bite. Starting here, go up six posts - grizzly bites through a 4-inch pine tree ( in a single snap of his jaws ).
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Post by King Kodiak on Dec 30, 2018 22:10:59 GMT -5
Yea i read that. That was incredible.
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Post by brobear on Jan 25, 2019 10:45:11 GMT -5
www.academia.edu/239888/Bite_forces_and_evolutionary_adaptations_to_feeding_ecology_in_carnivores_Ecology_ Species BM (kg) BF ca (N) BF carn (N) BFQ ca BFQ carn D Ursidae Ailuropoda melanoleuca 117.5 1298.9 1815.9 151.4 141.8 1 Tremarctos ornatus 100.0 795.1 946.6 103.1 82.1 1 Ursus americanus 140.0 744.3 1003.6 77.2 69.9 2 Ursus arctos 251.2 1409.7 1894.9 99.3 90.3 2 Ursus malayanus 60.1 883.2 1189.6 160.5 143.6 2 Ursus maritimus 354.8 1646.7 2349.6 92.3 89.4 6 Ursus thibetanus 125.9 858.3 1135.7 95.6 84.8 2 Ursus ursinus 120.2 522.1 712.0 59.9 54.7 7
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Post by King Kodiak on Jan 25, 2019 16:48:20 GMT -5
Ursus maritimus having the higher bite force of the bear species is not surprising.
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Post by brobear on Jan 25, 2019 19:00:07 GMT -5
Ursus maritimus having the higher bite force of the bear species is not surprising.
I do not comprehend these numbers and their meanings; but no - the polar bear does not have the greatest bite-force.
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Post by King Kodiak on Jan 25, 2019 19:07:41 GMT -5
Ursus maritimus having the higher bite force of the bear species is not surprising.
I do not comprehend these numbers and their meanings; but no - the polar bear does not have the greatest bite-force. Oh but it has the higher number in that list Brobear. It makes sense since they can sometimes penetrate the walrus very thick hide.
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Post by brobear on Jan 26, 2019 3:11:43 GMT -5
This is Shadows response to this chart: I put this link here too. It looks quite interesting, even though polar bear and brown bear have very good bite strengths in reality, when looking at relative bite strength compared to size, giant panda and sun bear are in their own category Shadow adds: So first BM is weight of an animal. BF ca looks like to be niting force with canines and then BF carn "inside" in mouth, like when getting a real good bite and for instance crashing bones of carcass. BFQ ca and BFQ carn gives pound to pound relative strength, higher number is better there. So polar bear, tiger, brown bear and lion seem to be top 4, with brown bear and lion there is interesting, that brown bear has stronger force with canines and lion in that other figure. Jaguar is interesting also, not quite there where people are used to see it. I mean tiger and lion beat it also in relative strength figures.
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Post by King Kodiak on Mar 6, 2019 18:27:45 GMT -5
TIGERLUVER Quick note as this seems to be a common misconception, bite force studies don't usually involve an animal actually biting. The measurements are based on skull morphometrics such as the area of the masseteric fossa. In other words, all animals studied are dead and their dry bones are simply being measured. The equipment includes a caliper, maybe a CT scanner, and a computer, no pressure sensors involved. wildfact.com/forum/topic-the-strongest-bites-in-the-animal-kingdom?action=lastpost
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Post by Deleted on May 24, 2019 8:53:32 GMT -5
Ok so basically no one knows how hard a polar bear can really bite? Estimating a larger polar bear has stronger jaws than a smaller lion and a smilodon (bite is 1/3 that of a lion): carnivora.net/showthread.php?tid=5502Now a smilodon has more robust limbs than a lion but its bite force is weaker than a lion. Since an average polar bear has stronger jaws than an average lion, its jaws would also be stronger than a smilodon. The polar bear's jaws can at least damage beluga's thick skin: Credited to Verdugo. The beluga in the first picture had was attacked by a female polar bear.
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Post by OldGreenGrolar on Jun 7, 2019 21:07:17 GMT -5
Although the sloth bear has the weakest bite force out of all bears, its bite still hurts.
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Post by OldGreenGrolar on Jun 9, 2019 7:04:54 GMT -5
Bears killing style is similar to canines as they bite as well as shake with their jaws.
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