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Bears of the Pleistocene

China Smilodon-Rex Offline
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(10-22-2018, 03:05 PM)brotherbear Wrote: Epaiva says: It was a huge Brown Bear larger than Kodiak Brown Bears. 
 
This brings to mind the now extinct California grizzly. I read the book, "California Grizzly" by Storer. It appears that this grizzly might have been a Kodiak-sized brown bear. Would you agree?  Pictured ( in art ) California grizzly meets short-faced bear. 
 

*This image is copyright of its original author
 I may remember that grizzly's specimens are rare in La Bera, even less than Arctodus, well the grizzly bear may choose to avoid any battle conflict when meet the Arctodus, but the grizzlys in Pleistocene were as huge as modern Kodiak bear, so the  gap of size  may not very large when you compared with modern grizzly
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Picture of cave bear skeleton i took today
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India brotherbear Offline
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https://fineart.ha.com/itm/fossils/mamma...96-81039.s    
  
Fossil Bear Claw
Ursus uralensis
Pleistocene
Russia
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Cave bear
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( This post was last modified: 11-02-2018, 05:45 AM by Ghari Sher )

(02-04-2016, 03:35 PM)brotherbear Wrote: Cave art in France depicts the cave bears in red which suggests that cave bears were typically red ( reddish brown ) in color. 
 
                                                                                     
*This image is copyright of its original author

I agree with what @Pickets said - that might only reflect the available colours at the time. We also have reddish paintings of the cave hyena and European ice age leopard, which might not necessarily reflect their true colours (particularly for the latter animal).

*This image is copyright of its original author

Knowing that cave bears were mainly forest-dwellers, I'd suspect they had a dark brown coloration as brown bears in similar environments tend to have, but this might vary, e.g. with the alpine varieties being lighter and more rocky in colour to blend in with their surroundings.
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(10-13-2016, 05:16 AM)GrizzlyClaws Wrote: That's why the Tyrant Polar bears weren't really extinct, their mtDNA is still remaining within the modern Polar bears.

Only their Y-DNA (Irish Brown bear) was completely gone without any carrier left.

Are there any studies to suggest such a thing?
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(01-23-2018, 12:20 PM)brotherbear Wrote: Post by brobear on Jan 21, 2018 at 5:20pm
hamzatriestoblog.quora.com/Interesting-new-findings-on-Ice-age-carnivores

Interesting new findings on Ice age carnivores
Hamza Ahmad Shaikh

This is actually a paper from June 2015, and I only hatched the thought to share now, so I should have told you earlier, but alas, here it is.
Unfortunately, only the abstract is available free of charge, but it's still an interesting read (I haven't read the actual paper). It's really challenged some of the preconceptions we've had about ice age carnivores in the Mammoth steppe. Here's the Highlights + Abstract (ctrl+c'd and ctrl+v'd):
Highlights
•Cave bears were virtually all herbivores.
•Giant short-faced bears were consuming meat but not necessarily purely carnivores.
•Scimitar tooth cats were not specialized mammoth predators.
•Most cave lions were focussing on reindeer, especially when competing with other large carnivores.
•Wolves outcompeted cave lions in Europe during Lateglacial.
Abstract

Isotopic tracking of carnivore palaeoecology is a relatively new approach that yielded important results for the study of the non-analogue mammoth steppe biome. After describing the prerequisite to apply this approach and the possible complications, the main achievements will be described for extinct carnivore species such as scimitar-tooth cat Homotherium serum, cave lion Panthera spelaea, giant short-faced bear Arctodus simus, cave bear Ursus spelaeus s.l., as well as for ancient representatives of extant species such as brown bear Ursus arctos and wolf Canis lupus. Isotopic tracking showed that scimitar-tooth cats in Alaska were not specialist proboscidean predators but rather generalist consumers of other large herbivores. The majority of cave lions analysed so far were focused on reindeer, some individuals were specialized on cave bears, especially in contexts of competition with cave hyenas. Giant short-faced bears in Alaska were not pure herbivores and consumed meat from reindeer, muskoxen and possibly other predators, but may have still incorporated plant resources in their menu. In contrast, all cave bear populations studied so far for which a clear dietary reconstruction could be done were virtually pure herbivores, only a few cases are still unclear. Interestingly, brown bears used the opposite extreme of the dietary spectrum when competing with other large bears such as cave bears and giant short-faced bears, i.e. were more carnivorous in Europe and more herbivorous in Alaska. Finally wolves seem to have been outcompeted by hyenas but became dominant predators during the Lateglacial in Europe to the expense of the last cave lions. The results obtained through this approach are also relevant for improving conservation strategies of endangered extant large carnivores.
Paper: Isotopic tracking of large carnivore palaeoecology in the mammoth steppe
I found these findings very interesting, mostly due to my fascination for ice age animals, but also because of how they challenged our previous notions of some of these carnivores.

From the beginning, it was clear to me that the Cave bear wasn't very carnivorous, but I had always figured they had a sizeable amount of meat in their diet, like most modern bears do. It seems that they were actually far more herbivorous than that - to the point where, when their ranges overlapped, the cave bear's close cousin, Ursus arctos, had to exploit a more carnivorous diet in order to avoid competition for plant materials with its larger relative. Known also for its conflict and relationship with Neanderthals (whose validity was brought to my attention by Rolf Kohl, see Cave bear hunting in Hohle Fels Cave in the Ach Valley of the Swabian Jura and Withering Away—25,000 Years of Genetic Decline Preceded Cave Bear Extinction), its reputation as a giant savage ice age bear has been somewhat softened. In fact, this isn't really a carnivore, unlike the others discussed in the paper with their meaty diets. While it was larger and by no means cuddly, I would wager you'd be more likely to be hunted by a brown bear than a cave bear, should you travel to Europe during the ice age.

I don't have much familiarity with the Short-faced bear, but from what I had heard, they were supposedly highly-carnivorous, and were either viscous juggernaut hunters and/or kleptoparasites, scavenging and chasing other predators such as the contemporaneous (but smaller) Smilodon and American lion (see here) off their kills. Indeed, it does appear that their Brown bear neighbours were exhibiting the opposite extreme to those in Europe, but being a bear, one would expect that this beast, however exaggerated by popular multimedia, would have been at least capable of mixed feeding. This also attests to the adaptability of Brown bears to varying conditions, and may help explain why they survived, while other large bears became extinct.

This one struck me the most. Whenever one read of Homotherium, there would be at least some mention of its Mammoth-eating tendencies. Hell, I was even lead to write about this ostensible pachyderm eater's tendencies in Hamza Ahmad Shaikh's answer to What are some fascinating facts about the woolly mammoth?. Indeed, findings from Friesenhahn Cave in North America bore evidence that H. serum, the North American species of scimitar cat, hunted and killed young proboscideans, but given the cat's build, it did appear that these lithe sabretooths weren't ideally equipped mammoth killers.

Mauricio Antón touched on this in one of his blog posts,Homotherium, slayer of giants? on the hunting of mammoths by these cats. He concluded that these cats were either hunting in packs very frequently, or that the Friesenhahn mammoth/ mastodon killings were a local phenomenon, not typical of the entire genus. In the mammoths steppe ecosystem, mammoths were to be found, but in far larger quantities there was other large game that you would expect a lion-sized cat to be hunting. According to Sergey Zimov, "On each square kilometer of pastures lived 1 mammoth, 5 bison, 8 horses, 15 reindeer. Additionally, more rare musk ox, elks, wooly rhinoceros, saiga, snow sheep, and moose were present. Wolves, cave lions and wolverines occupied the landscape as predators. In total, over 10 tons of animals lived on each square kilometer of pasture- hundreds of times higher than modern animal densities in the mossy northern landscape." (see: Sergey Zimov’s Manifesto), leaving plentiful prey for scimitar cats to be exploiting. According to one blog post by someone who did buy and read the paper, the Yak was the preferred prey of scimitar cats:

Then we come to Eurasian cave lions - for some reason or other, my favorite ice age creature. It was already clear to me that they hunted large quantities of Reindeer meat, with cave bears constituting for most of their diet's remainder. My suspicions for the reason this was the case has been reaffirmed, as it appeared that the Cave hyena had a diet comprising of larger quantities of horse and woolly rhino, amongst others (Prey deposits and den sites of the Upper Pleistocene hyena Crocuta crocuta spelaea (Goldfuss, 1823) in horizontal and vertical caves of the Bohemian Karst (Czech Republic)), and that other carnivores had differing diets to avoid competition.

What surprised me about the cave lions is the conclusion that wolves out competed them. I had read beforehand that the cave lion experience a decline in range after the extinction of the cave hyena, but I was unsure why this would be the case, seeing as it was a competitor. It's clear to me now, that the hyena's suppression of the wolf in Europe prevented it from becoming to widespread (though they were huge, see Megafaunal wolf). In the dying days of the late glacial, the cave lion probably struggled to find enough reindeer, and the more generalistic wolf may have been one of the last nails in the coffin for this cat.

Haha!
I'm the author of that blog just to let you know. Didn't realize anyone had quoted that here.
In case you're interested, I wrote a more extensive piece on this after actually accessing and reading the papers (some were available, others.... well, what do you people think of sci-hub?) pertaining to this issue.
https://www.deviantart.com/anonymousllam...-645479135
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India brotherbear Offline
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( This post was last modified: 11-02-2018, 02:37 PM by brotherbear )

Very interesting study Ghari Sher. I do not try to pull the wool over anyone's eyes; I have a G.E.D. education. So, I have very little understanding of the graphs. But that which I do understand, interesting is too little a word to describe.
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(11-02-2018, 02:37 PM)brotherbear Wrote: Very interesting study Ghari Sher. I do not try to pull the wool over anyone's eyes; I have a G.E.D. education. So, I have very little understanding of the graphs. But that which I do understand, interesting is too little a word to describe.

I'm not that far into the education system either, I suppose.
In any case, I am far from an expert on the field of stable isotope studies, but my understanding of the concept is that different plant tissues contain different concentrations of certain stable isotopes of carbon and nitrogen, and the animals that eat them will have their distinct isotopic signatures and so will their predators, but through each trophic level the concentration of certain stable isotopes will increase, so predators show up with higher values on the graph, usually. Predators with similar isotopic values will have eaten similar prey with dietary overlap, predators with dissimilar values eat less prey in common, and so forth.
This is as far as my understanding goes, if you want to learn more about how that works, I'd suggest looking it up on YouTube or some other site, e.g.



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( This post was last modified: 11-03-2018, 08:44 PM by Ghari Sher )

(02-07-2017, 08:40 PM)brotherbear Wrote: After reading posts #181 and #182, was Ursus maritimus tyrannus an early polar bear, an intermediate between the grizzly and the polar bear, or merely a very large grizzly?

Allow me to shed a little light on this mysterious bear..........

As for those first two possibilities you bring up, the Kew Bridge ulna is much younger than the oldest know remains of polar bears, which is a mandible dating back ~130kya, and they are believed to have diverged from brown bears quite early on, about 400,000 years ago. So even if the ulna was a polar bear, it would not have and early example of this species by any means, nor an intermediate, at least not one on the line toward extant polar bears.

Of course, you mention, the scientists at the NHM are convinced that the ulna is actually a brown bear. This is based on personal communication with Andy Currant (now retired).

This isolated ulna fits into perspective once we take into account some of Currant's other writings - he has written extensively on the mammals of Pleistocene Britain, and the different assemblages which existed through the different climatic shifts, etc.

One detail which might raise eyebrows is when the Currant & Jacobi (2001) [1] describe one particular period of the British late Pleistocene - a period known as MIS 5a, which spanned from approximately 85-65 thousand years ago, known in the British biostratigraphy as the Banwell Bone Cave MAZ (mammal assemblage-zone), after the cave site where this period was first recognized. During this period, we witness a very low diversity cold-climate fauna inhabiting the British Isles at various sites across the country including the aforementioned locus typica. Only two large carnivore species - wolves and brown bear, are known to have existed in the carnivore guild.

The brown bear remains are consistently described as being extremely large in the literature, and what few images I can find of the remains from the locus typicus certainly suggest as much.

Quote:
*This image is copyright of its original author

21 The strange assemblage from Banwell Bone Cave includes a giant bear, probably an even more formidable predator than the polar bear. The top of its humerus (above) is compared with the whole humerus of a brown bear (left).
From [2]

When they describe the brown bear briefly in their 2001 paper, Currant & Jacobi interestingly cite Kurten (1964) to exemplify the huge brown bears at this time, suggesting that by this point they had already re-assigned the Kew Bridge ulna to Ursus arctos, long before the personal communication sent by Currant in 2008.
Quote:Bison and reindeer are the dominant elements of this fauna, with wolf, wolverine, mountain hare and an extremely large variety of brown bear (e.g. Kurten, 1964) as their consistent companions.

From [1]

Looking at Currant (2004)'s description of the brown bear of this period raises suspicions further:
Quote:One of the most spectacular features of this collection are the remains of a huge form of brown bear which closely matches the living polar bear in many features. This appears to have been the dominant predator in this restricted, cold stage assemblage.
From [3]

This extremely large form of brown bear which closely resembles the polar bear.............. where does that ring a bell?

Taking a closer look at the lithostratigraphy and biostratigraphy at the Kew bridge site, we get our suspense settled. The site dates to between MIS 6 and MIS 4.
The fauna found at the site are very characteristic of the period of MIS 5a in the British Isles.
Quote:Based on the dominance of reindeer and the co-occurrence of very large brown bear, the assemblage from Kew Bridge was assigned to the Banwell Bone Cave MAZ and consequently attributed to MIS 5a (Currant and Jacobi, 1997, 2001, 2002; Gilmour et al., 2007).
From [4]

This makes the Ursus "maritimus tyrannus" holotype another specimen representing the extremely large form of brown bear that inhabited the British Isles at this period. Interestingly, the fact that this brown bear ulna was misidentified as being a polar bear seems to largely fit in with what I have read of the descriptions of the MIS 5a brown bears of Britain from other sites(namely Banwell Bone cave) - these brown bears seem to be likened to the polar bear very often - they seemed to be very polar bear-like in their morphology.

Quote:Predators likewise changed, as the extremely narrow carnivore guild enjoyed rich herbivore pickings. Fearsome brown bears became so large that in the past their remains were misidentified as polar bear and, like the polar bear, they were probably active and formidable hunters.
From [5]

Various other sites yield this same pattern of fauna, including the brown bear remains, such as the nearby Isleworth site just an hour's walk away from Kew Bridge, which possibly has a similar depositional history:
Quote:
*This image is copyright of its original author

Figure 9.4: Ursus arctos ulnas from Early Devensian deposits at Kew Bridge and Isleworth and Middle Devensian deposits at Kent’s Cavern (left-right), illustrating the large size of the bear at the former.
From [4]

These bears are consistently larger than the brown bears found in the British Isles during other periods, as show above. Seems that Kurtén misidentified this bear as a polar bear.


(02-03-2016, 06:12 AM)brotherbear Wrote: The Pleistocene bear called "the tyrant sea bear" was even larger than the big modern polar bears of today. Could this be because he was once a hunter of musk ox and perhaps some now extinct tundra herbivores and a scavenger of mammoths who then gradually learned to hunt seals? 
This is where we move to the paleoecological context behind this very large brown bear form that inhabited the British Isles during this narrow period of the late Pleistocene.

In earlier interstadial deposits in Britain, we have evidence of warm-climate fauna in MIS 5c and 5e, e.g. Hippopotamus & Paleoloxodon, as well as predators such as cave lion (Panthera spelaea) and hyena (Crocuta crocuta spelaea), but after the cold period of MIS 5b, it appears that these fauna were forced to leave/were extirpated. By the milder, though still somewhat cold period of MIS 5a, the geological evidence suggests that the now warmer climate raised sea levels just high enough to isolate the British Isles from the European mainland by a presumable-narrow English channel, though the extent of the risen sea levels is unknown. Certainly, glaciers still existed in the north of the country. The ability of species to swim, or even, perhaps, their ability to make crossings over sea-ice, may have acted as a natural biological filter. Whatever animals were able to survive the cold glacial conditions of MIS 5b, were now isolated from the rest of Europe on a somewhat-milder Island.[5] The environment was likely still cold however, with a mean winter temperature estimated at -20±10℃ .[6]
Among the large herbivores, only steppe bison and reindeer are known to have been present at this time, while the European mainland housed the "standard" herbivore guild of the mammoth steppe (woolly mammoth, rhino, horse, and giant deer in addition to the aforementioned two).
The carnivore guild was also strikingly different. Only wolves, and this aforementioned gigantic brown bear are recorded in the British Isles. Meanwhile the mainland guild contains the additional cave lion and cave hyena. Another predator that once frequented the British Isles is missing at this period - man. Neanderthals are known to have existed in Britain before MIS 5a, but during this period there is no trace of them. This strongly suggests that Neanderthals were absent in the British Isles at this period, returing only in MIS 4, about 60,000 years ago, when the glaciers expanded and a land-bridge arose once more (the same is true for most of the other large fauna), before being replaced by their more slender African cousins about 20,000 years afterwards.[5]

In their ecological liberation - the wolves and brown bears had this island home all to themselves. Mass estimates suggest that both the wolves and brown bear were the largest ever to have lived in the British Isles. Analysis of the teeth of the wolves suggest some heightened level of durophagy, suggesting they had expanded into the niche of the absent hyena.[7]

Looking at the postcrania of the bear remains, the informaton that I can derive is that they were adapted to hunting the large ungulates that lived on the island, but past that I can't gather very much. I suppose this raptorial hunting style led to some convergence with the polar bear, but you be the judge of that.
Quote:The bear remains are often huge, suggesting a powerfully built runner with small teeth, and enormous claws, an active hunter like a polar bear.

From [2]

Analysis of the wear on the teeth of brown bears from Banwell Bone Cave suggests a highly hypercarnivorous diet, sharing many similarities to the polar bear in the nature of the tooth wear.

Quote:The microwear results as seen in the bivariate plots from the Banwell Bone Cave bears reveal many similarities with high-latitude species such as U. maritimus, U. americanus and U. arctos from Russia. In addition, the PCA revealed that the dietary ecospace of these bears had commonalities with those of U. maritimus and U. thibetanus at the present day. Some of the main microwear features noted on these large extinct brown bears are the highest score for scratches width after U. maritimus, an absence of puncture pits and a moderate percentage of coarse scratches (Fig. 4.19.E). The absence of puncture pits indicates that fruits with seeds did not play a part in the diet of U. arctos from Banwell Bone Cave (e.g. Semprebon et al ., 2004). As well as hunting, flesh may also have been scavenged from (frozen) carcasses, as seen in modern polar bear utilisation of marine mammals (Bentzen et al., 2007).
From [8]
In regards to them hunting muskoxen or scavenging mammoth - this wasn't possible since neither coexisted with these isolated island bears. They main prey was almost certainly the steppe bison and reindeer they coexisted with
Will have more to say in good time.
Sources:
[1] http://doc.rero.ch/record/209912/files/PAL_E4236.pdf
[2] https://books.google.co.uk/books?id=1lcd...wQ6AEIXDAJ
[3] http://www.bleadon.org.uk/media/other/24400/BleadonCavern_HES_150_Years_Chapter_7.pdf
[4] https://pure.royalholloway.ac.uk/portal/files/4059178/2011JubyCPhD.pdf#page=336
[5] https://books.google.co.uk/books?id=Xeye...0Q6AEIKjAA
[6] https://onlinelibrary.wiley.com/doi/abs/...0.CO%3B2-N
[7] https://s3.amazonaws.com/academia.edu.do...variab.pdf
[8] https://pure.royalholloway.ac.uk/portal/...hd.pdf.pdf
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India brotherbear Offline
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According to the information given by  on post #355, it appears that perhaps Ursus maritimus tyrannus was misnamed. Perhaps Ursus arctos tyrannus would be more fitting. Perhaps it time. All of this is fascinating and new to me. Great stuff Ghari Sher
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( This post was last modified: 11-03-2018, 10:29 PM by Ghari Sher )

(11-03-2018, 02:09 PM)-brotherbear Wrote: According to the information given by  on post #355, it appears that perhaps Ursus maritimus tyrannus was misnamed. Perhaps Ursus arctos tyrannus would be more fitting. Perhaps it time. All of this is fascinating and new to me. Great stuff Ghari Sher

Well, Ursus "maritimus tyrannus" is pretty likely not to be a valid subspecies, but I would be more cautious to name Ursus arctos tyrannus as a valid subspecies instead, since they do have to be a phylogenetically distinct form of bear to the already-named mainland brown bears of late Pleistocene Europe, known as steppe brown bears - Ursus arctos priscus.
That said, it is true that these British bears were isolated for a considerable amount of time, from about 87.22-66.8 thousand years ago, based on the dating of this period, spanning roughly 20,000 years, until the glaciers expanded and the mainland fauna were able to return to the British Isles, causing a prompt shrinking + ecological subjugation of both the brown bears and wolves:
https://onlinelibrary.wiley.com/doi/abs/10.1002/jqs.898
https://onlinelibrary.wiley.com/doi/abs/...2/jqs.1112

By comparison, the Kodiak bears, alongside those of the other Alaskan islands, have only been isolated for about 10,000 years, and have also grown to huge sizes.
http://research.amnh.org/~rfr/paetkau98.pdf
Given that they are ostensibly recognised as their own subspecies (U. a. middendorffi), I supposed this may lend credence to the approach of separating the mainland Ursus arctos priscus from the larger insular offshoot Ursus arctos tyrannus, but I won't make any strict judgements regarding that, since the taxonomy of these British bears below the level of species is not really discussed in the literature. But there is a possible scenario - of there being British tyrant brown bears while the mainland has steppe brown bears, who eventually migrated to the British Isles come the landbridge, and genetically swamped the tyrant brown bear population.

Whether we should consider them to be steppe brown bears is something which has been on my mind, I have e-mailed Prof. Adrian Marciszak about this, though I have yet to receive a reply.

*This image is copyright of its original author
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I don't think anyone here has spoken of the extremely large steppe brown bear remains described by Marciszak (2017).


Quote:
*This image is copyright of its original author

Figure 7. Comparison of femora distal halves of arctoid (1–3) and speleoid (4–5) bears. Steppe brown bear Ursus arctos priscus: left femur from Skarszyn SKA/M/Ua/1 (1a–c) and right femur from Niedźwiedzia cave JNK/Ua/71 (2a–c) (confirmed genetically). Eurasian brown bear Ursus arctos arctos: left femur from early medieval castle (3a–c). Ursus ingressus from Niedźwiedzia cave: male JNK/Us/12541 (4a–c) and female JNK/Us/44541 (5a–c).
https://www.researchgate.net/publication...rhinoceros

In particular the distal femoral fragment on the far left from Skarszyn, Poland. It has a distal width of 124.2mm, and an estimated total length of femur of 550-560mm, which is a huge bear indeed.
It equals if not dwarfs the cave bear remains with which it is compared. If anyone can find cave bear femora that exceed this giant, I'd be grateful if they tell me.

Of course this is probably a very large male relative to the average steppe brown bear, but it does go to show the immense size reached by these Pleistocene brown bears in Europe.
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( This post was last modified: 11-04-2018, 04:11 AM by brotherbear )

The brown bear of ancient Europe, according to the tales, were big ferocious beasts similar, it seems, to the grizzly of pioneer N. America. Much information in this book: THE BEAR - History of a Fallen King - by Michel Pastoureau.
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Bears and other extinct predators.  
                                                    https://www.youtube.com/watch?v=rStZirwUaU8
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