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Skulls, Skeletons, Canines & Claws
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 (12-27-2016, 08:55 AM)GrizzlyClaws Wrote: This particular skull belongs to a Barbary lion, maybe it could have proportionally longer canine teeth than the normal African lions? The average Christiansen and Harris (2005) data on crown height:CBL produce a skull of over 400 mm in just CBL. Even the highest canine height to CBL ratio they have produces a CBL of 370+ mm for the canine we have here. So perhaps there is something up here. 
So the standard deviation suggests that any lion fang close to 12 cm cannot belong to a small skull.
And check the resin cast of the African lion canine teeth on eBay, and it suggests that a 4.5 inches resin cast can only fit into a large male lion skull where there are missing canine teeth. http://www.ebay.com/itm/Set-of-massive-African-lion-canines-fangs-cast-replica-taxidermy-/262367649048
@tigerluver
A 13 cm lion canine from University of California, Berkeley.  *This image is copyright of its original author  *This image is copyright of its original author
Nice find @GrizzlyClaws. Here's the full paper:
GROWTH DIFFERENCES IN THE SABER-TOOTH OF THREE FELID SPECIES I'm assuming that the canine is American lion and not modern lion as that is what was sampled. The authors assumed P. atrox and P. leo are subspecific. Unfortunately the authors do not give explicit measurements in the paper or the supplement. (01-04-2017, 03:49 AM)tigerluver Wrote: Nice find @GrizzlyClaws. Here's the full paper: I guess it should be this particular canine tooth, since the shape looks almost identical.  *This image is copyright of its original author  *This image is copyright of its original author
African lion
 *This image is copyright of its original author  *This image is copyright of its original author
Cave bear
 *This image is copyright of its original author  *This image is copyright of its original author  *This image is copyright of its original author  *This image is copyright of its original author
Cave bear
 *This image is copyright of its original author  *This image is copyright of its original author  *This image is copyright of its original author  *This image is copyright of its original author
Why is the cave bears canine so massive and blunt? Must of been used for high force bites.
(01-05-2017, 07:30 AM)Pckts Wrote: Why is the cave bears canine so massive and blunt? Must of been used for high force bites. All bear canines look like that, having proportionally shorter crown and bigger root. And they are not as sharp and smooth as the big cat canine teeth. It is quite obviously that most bears only used their canine teeth casually, so they don't need the professional killing canine teeth like that of the big cats.
Do bears have a longer lifespan than big cats?
I'd assume a shorter/blunt canine would be more durable than a longer big cat canine and maybe that is because they need them for a longer time span? (01-05-2017, 07:39 AM)Pckts Wrote: Do bears have a longer lifespan than big cats? It could be, since they do have proportionally bigger canine root, so it is less prone to break apart. And the bear canine teeth look ogre-ish, while the big cat canine teeth look like a professional killer, but remain elegant nevertheless. 
@Pckts,
Bears live up to much longer than big cats, especially the herbivorous, insectivorous, or omnivorous ones. Brown bears can live up to a little more than 30, and the hyper-carnivorous polar bears can live up to 23. Both are in the wild. Big cats probably don't live as long due to them being solely adapted to dispatch prey for a lifetime, and so did their ancestors who also lived quite short. Carnivorous animals usually live shorter than animals with other feeding habits. (01-05-2017, 10:15 AM)Polar Wrote: @Pckts, The Polar bears have shorter lifespan than the Brown bears, and their canine teeth are also more elegant killer-like. 
Bears are long-lived when compared to other Carnivorans... http://voices.nationalgeographic.com/2013/09/02/oldest-wild-bear-in-the-world-dies-in-minnesota-at-almost-40-years-of-age/
Oldest-Known Wild Bear in the World Dies in Minnesota at Almost 40 Years of Age. http://www.kstatecollegian.com/2009/06/10/oldest-grizzly-bear-in-captivity-dies-after-inspiring-conservation/ Brownie arrived at the zoo in 1968 after retiring from the circus. His exact age is not certain, but he was no younger than 56 years old when he died, making him possibly the world’s oldest grizzly bear. According to Lousch, most grizzly bears live to be about 20 to 25 years old, meaning Brownie was about 150 in “bear years.” *I will add to this that it seems that animals which are born in litters usually have shorter life-spans than those born one, two, or three at a time. As for the shape of the teeth, with the exception of polar bears, bears are more food gatherer than predator but the mature males can be very combative with each other. Those thick canines should not break too easy in a brawl. |
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