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Post by Montezuma on Feb 16, 2022 19:30:44 GMT -5
Beautiful paintings of prehistoric wildlife can be found depicting very unlikely happenings. That is very beautiful. They all fear the gaint bear.
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Post by brobear on Feb 18, 2022 4:31:14 GMT -5
Quote: That is very beautiful. They all fear the giant bear. *I agree that this artwork shows great talent. But, the scene is ( IMO ) very unrealistic. Arctodus simus probably did very little hunting, if any hunting. He was simply not designed for the chase. If he did go after a long-horned bison, the giant short-faced bear would have chosen a juvenile. The bulls were probably the biggest bovines ever, standing 8 feet high at the shoulders.
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Post by brobear on May 11, 2022 1:41:12 GMT -5
*Note: I find it strange that while a huge assortment of animals were migrating across Beringia from Russia/Siberia into Alaska, Arctodus simus never migrated East into Asia.
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Post by brobear on Aug 12, 2022 3:38:19 GMT -5
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Post by brobear on Sept 10, 2022 2:26:37 GMT -5
Demythologizing Arctodus simus, the ‘short-faced’ long-legged and predaceous bear that never was. www.tandfonline.com/doi/pdf/10.1080/02724630903416027 CONCLUSIONS Our results suggest that A. simus was neither a super-predator nor a specialized scavenger, at least over its whole geographic range. Instead, the ecomorphological analyses suggest that the overall craniodental morphology of this ursid is similar to that found in the living omnivorous bears. In addition, we have shown that the snout of A. simus is not shorter than expected for an omnivorous bear this large, and also its legs are not as relatively long for its size as previously assumed. Thus, we suggest that the popular description of A. simus as a ‘short-faced’ bear should be revised in the light of the new evidence. Although it is true that A. simus exhibits a broad rostrum, this is also the case of the Malayan sun bear and the Andean bear, which are both omnivorous. Thus, we conclude that this character is not an accurate indicator of a highly carnivorous diet in bears. In the same line of reasoning, we agree with Sorkin (2006) that the dental characters recognized by Kurten (1967) as evidencing a ´ morphological trend towards carnivory are very ambiguous, and that the previous interpretations of A. simus as a scavenging specialist (Matheus, 1995) are based exclusively on the analysis of bone collagen isotopes, which do not allow distinguishing among highly carnivorous species from those more omnivorous that consume a relatively high percentage of flesh (Sorkin, 2006). In short, we suggest that A. simus may be best envisaged as a colossal omnivore whose diet probably included varying amounts of meat according to food availability. Of course, we do not wish to imply that A. simus did not prey occasionally on bison, deer, or ground sloths, nor that it did not scavenge the carcasses left over by the hypercarnivores such as saber-tooth cats (Smilodon fatalis and Homotherium serum), giant lion (Panthera atrox), and dire wolf (Canis dirus). We simply affirm that A. simus did so in a similar manner as some North American populations of brown bears (e.g., Alaska and Yukon) currently do so. We do agree with Matheus (1995) that the huge body size of this extinct bear probably facilitated kleptoparasitism of ungulate carcasses. In fact, the ecological circumstances in the Pleistocene of North America differed from those of today, due to the presence of saber-tooth cats in the carnivore guild. These predators were probably less able to exploit a carcass than modern pantherine cats, because their dentition was even more specialized for meat slicing (Christiansen, 2008). This, combined with jaw gape restrictions resulting from their hypertrophied upper canines (Emerson and Radinsky, 1980) and weaker bite forces compared to pantherines (McHenry et al., 2007), probably forced saber-tooths to consume exclusively soft tissues (Palmqvist et al., 2007). Such highly derived craniodental anatomy probably resulted in the availability of relatively large amounts of flesh and all bone nutrients in their kills. These unexploited resources might have opened broad opportunities of scavenging for other species such as A. simus (for a review on the ecological connection between saber-tooths and the giant bone-cracking hyenas in the Old World, see Arribas and Palmqvist, 1999). Under this ecological scenario, it would be reasonable to assume that meat and bone marrow were likely to be the primary food resources for some Northern populations of A. simus(Matheus, 1995), in which the survival during the cold season could have depended on the regular scavenging of ungulate carcasses, as in Alaskan brown bears (Pasitschniak-Arts, 1993). Such inference is in agreement with the climatic cycles of the Pleistocene, an epoch in which resource availability was frequently changing (Figueirido et al., 2009). However, this dietary niche should not be generalized for the entire biogeographic range of the species. In any case, the paleobiology of the wrongly termed ‘shortfaced’ bear is far from being well understood. In our view, the current situation demands a deep taxonomic revision, including a more detailed inspection of the appendicular adaptations of ursids and perhaps the exploration of skull biomechanics using finite element analysis. Such approaches could contribute crucial insights into the paleobiology of this emblematic fossil species.
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Post by brobear on Sept 10, 2022 2:28:00 GMT -5
From post directly above: JOURNAL OF VERTEBRATE PALEONTOLOGY, VOL. 30, NO. 1, 2010 FIGURE 6. Snout length relative to neurocranial length in the living bear species and in A. simus. Note that all crania are scaled to the same length. Abbreviations: SL, snout length; NL, neurocranium length; X, mean of (SL/NL) × 100 for each species; N, sample size. The orbit outlines have been highlighted.
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Post by brobear on Oct 4, 2022 8:50:55 GMT -5
American Serengeti by Dan Flores As for North America's own Pleistocene bear, the gracile and active short-faced bear, the Canadian biologist Valerius Geist believes that until it went extinct 14,000 years ago, this super-aggressive bear may have single-handedly kept humans from migrating across the Bering land bridge to America.
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Post by brobear on Jan 30, 2023 6:05:38 GMT -5
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Post by brobear on Jan 30, 2023 6:12:23 GMT -5
The two biggest of the big bears. Mar 6, 2021 at 6:56pm theundertaker45 said: Both models provided by "Prehistoric Fauna". The two biggest bears that have ever lived right next to each other; on your right we have the giant Arctotherium specimen (based on a 620mm humerus) and on your left we have the "Behemoth of Kansas River" (based on a 646mm humerus). They are looking down at your average Joe... On all fours...
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Post by yz on Feb 8, 2023 6:23:06 GMT -5
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Post by OldGreenGrolar on Feb 8, 2023 6:50:38 GMT -5
/\ Very interesting. There are some articles which say the short faced bear is not as heavily built as other bears.I guess it depends on the type of short faced bears.
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Post by brobear on Feb 8, 2023 7:09:07 GMT -5
Reply #229; interesting observation. Brings to mind an opposite case, where some people claim that dachshunds and Basset Hounds have long backs. If Arctodus simus was pound-for-pound stronger than other bears, then he was one hellova beast. However; further study is needed before claiming this as a fact.
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Post by arctozilla on May 7, 2023 13:35:33 GMT -5
Replay #230 I would not disagree but brobear Is right that further evidence is needed.
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Post by arctozilla on May 7, 2023 13:36:28 GMT -5
/\ Very interesting. There are some articles which say the short faced bear is not as heavily built as other bears.I guess it depends on the type of short faced bears. Well I do believe that SF bears were strong for their sizes considering Andean bears are strong.
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Post by Deleted on May 7, 2023 15:25:40 GMT -5
Short faced bears were larger and stronger than any modern bears, there is no debate about that.
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Post by brobear on May 10, 2023 19:17:23 GMT -5
Extinct Short-faced Bear (Actodus spp.) Fact Sheet: Summary ielc.libguides.com/sdzg/factsheets/extinctshort-facedbear Last Updated: May 3, 2023 Disclaimer: Although San Diego Zoo Wildlife Alliance makes every attempt to provide accurate information, some of the facts provided may become outdated or replaced by new research findings. Questions and comments may be addressed to library@sdzwa.org.
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Post by arctozilla on May 14, 2023 3:59:15 GMT -5
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Post by arctozilla on May 14, 2023 4:13:39 GMT -5
Reply #143. Jurassic Fight Club isn't accurate, so it's the least documentary to take as example. The Mega Lion vs Mega Bear episode was also a garbage, it looked more like a sci fi movie than a documentary. The American lion had unrealistic proportions and speed to the point it looked more like a lion cub who got experimented in lab than a wild cat. Also how hell can it swipe out a sf bear twice as larger than itself in one paw swipe and how hell can survive a bite on the belly from a sf bear who had a devastating bite that crush elephant bones? Also an American lion would have most likely retreat from a sf bear most of time.
It also says JURASSIC Fight Club when there are a lot of episodes who take place much after the Jurassic Period.
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Post by brobear on May 14, 2023 10:12:57 GMT -5
Some seriously interesting information here by Warsaw.
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Post by Deleted on May 22, 2023 15:13:00 GMT -5
Carnivora.net is one of the most stupid forum ever made. But Warsaw seems to be a serious debater. Do you know the mail of Warsaw please? Thanks.
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