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Post by OldGreenGrolar on Mar 4, 2021 21:06:31 GMT -5
400 kilograms is equal to 881.85 pounds. I have doubts as to the accuracy of this. I guess we will never know for sure although I have a gut feeling Ursus Maritimus Tyrannus could be a giant brown bear. However, if I am proven wrong, at least something new is learn.
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Post by brobear on Aug 3, 2021 19:40:35 GMT -5
WORLD OF PREHISTORIC CREATURES 70 thousand years ago, near the coast of what is Britain today, wanders one of the greatest bears of all time, the Ursus maritimus tyrannus. From the fossil record of this mammalian is known only one fragmentary ulna described by Kurten in 1964, 48.5 cm long, from which you can extrapolate its size in approximately 1.7 meters high to the shoulder, which exceeds 1.2-1.4 mts of the modern polar bear. Its mass could vary between 700 to 1000 kilos, depending on the physical condition of the animal.
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Post by brobear on Aug 3, 2021 19:44:44 GMT -5
700 to 1000 kilos = 1,543 to 2,205 pounds. But, until proven wrong, I will consider this bear to be a brown bear.
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Post by brobear on Oct 17, 2021 2:28:18 GMT -5
Paleoartists 70 thousand years ago, near the coast of what is today Britain, wanders one of the greatest bears of all time, the Ursus maritimus tyrannus. From the fossil record of this mammalian is known only one fragmentary ulna described by Kurten in 1964, 48.5 cm long, from which you can extrapolate its size in approximately 1.7 meters high to the shoulder, which exceeds 1.2-1.4 mts of the modern polar bear. Its mass could vary between 700 to 1000 kilos, depending on the physical condition of the animal.
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Post by brobear on Mar 2, 2022 7:43:43 GMT -5
Credits to tostwear: Ursus (?) Tyrannus' ulna is 13% larger than that of a modern polar bear. When we increase it by 13% in weight, Ursus (?) Tyrannus reaches a weight of 790 kg. But when done using isometry, it becomes 1000+ kg.. Which is a more reliable weight? (I took the largest polar bear ulna and largest polar bear weight for reference not including stomach contents : 699 kg - 428 mm ulna) (113 x 699) / 100 = 789.8 kg (485 / 428)^3 x 699 = 1017.1 kg *Note: I think it a better idea to compare the ulna of Ursus ( ? ) tyrannus to the ulna of a modern Kodiak bear.
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Post by OldGreenGrolar on Mar 3, 2022 5:32:27 GMT -5
/\ I second that for some reason. Since Ursus Tyranus looks more like a brown bear, comparing its ulna with a Kodiak bear might be more accurate.
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Post by brobear on Mar 4, 2022 2:24:44 GMT -5
/\ I second that for some reason. Since Ursus Tyranus looks more like a brown bear, comparing its ulna with a Kodiak bear might be more accurate. Since all we have of this bear is a fossilized ulna ( arm bone ), any pictures you have seen are merely the artists interpretation. When first discovered, in London, the Finnish paleontologist Björn Kurtén in 1964 named him, "Ursus maritimus tyrannus" meaning "Tyrant sea bear". But today, some paleontologists consider this bear to be a huge brown bear. Truth is - we really don't know.
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Post by tostwear on Mar 7, 2022 8:31:46 GMT -5
Credits to tostwear: Ursus (?) Tyrannus' ulna is 13% larger than that of a modern polar bear. When we increase it by 13% in weight, Ursus (?) Tyrannus reaches a weight of 790 kg. But when done using isometry, it becomes 1000+ kg.. Which is a more reliable weight? (I took the largest polar bear ulna and largest polar bear weight for reference not including stomach contents : 699 kg - 428 mm ulna) (113 x 699) / 100 = 789.8 kg (485 / 428)^3 x 699 = 1017.1 kg *Note: I think it a better idea to compare the ulna of Ursus ( ? ) tyrannus to the ulna of a modern Kodiak bear. Thanks for replying I read many articles to understand which species Ursus Tyrannus is. But some call it brown bear, some say polar bear. That's why I chose to start with the only data we have. I want to ask my original question again. Will this bear weigh 1000+ kg or 790 kg?
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Post by brobear on Mar 7, 2022 8:42:13 GMT -5
If Ursus ( ? ) tyrannus was a polar bear, because of his constant body fat, which serves both for insulation and buoyancy, then he would weigh more than if he were a brown bear ( IMO ).
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Post by brobear on Mar 7, 2022 9:04:33 GMT -5
prehistoric-fauna.com/Ursus-maritimus-tyrannusUrsus maritimus tyrannus is an extinct subspecies of polar bear, known from a single fragmentary ulna found in the gravels of the Thames at Kew Bridge, London. It was named by the Finnish paleontologist Björn Kurtén in 1964 and is interpreted to represent a relatively large subadult individual: the ulna is estimated to have been 48.5 cm long when complete, recent studies only weigh it at 400 kg, for comparison modern subadult polar bear ulnae are 36–43 cm long. Dating back to the Late Pleistocene, approximately 70,000 years ago, it is the oldest fossil assigned to the polar bear; however, an unpublished reinvestigation of the fossil suggests that the fossil is actually a brown bear. Order: Carnivora Family: Ursidae Size: 3,5 m in length, 145 cm in height, 350 - 1000 kg of weight Time period: the Late Pleistocene of Northern Eurasia (70,000 years ago) Typical representative: Ursus maritimus tyrannus Kurtén, 1964 400 kg = 882 pounds. We must keep in mind that this huge fossil is from a subadult bear.
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Post by tostwear on Mar 7, 2022 13:38:44 GMT -5
If Ursus ( ? ) tyrannus was a polar bear, because of his constant body fat, which serves both for insulation and buoyancy, then he would weigh more than if he were a brown bear ( IMO ). But what if we reference kodiak? How many mm is the largest kodiak ulna? (I think the biggest kodiak on an empty stomach was 680 kg)
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Post by brobear on Mar 7, 2022 16:39:51 GMT -5
If Ursus ( ? ) tyrannus was a polar bear, because of his constant body fat, which serves both for insulation and buoyancy, then he would weigh more than if he were a brown bear ( IMO ). But what if we reference kodiak? How many mm is the largest kodiak ulna? (I think the biggest kodiak on an empty stomach was 680 kg) I agree 100% that this ulna should be compared to the ulna of a Kodiak bear. Also, compare that Kodiak bear's ulna to the ulna of a subadult Kodiak bear. Try to give an educated estimate of a full-grown Ursus ( ? ) tyrannus.
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