Відео

So your theory behind Terror-Bird ethology is they were like Dromaeosaurs but copied off the Carcharodontosaurs and their homework?

This is a great video! Although I have a question, You said the lion had a maximum bite force of 2,400 Newtons, The highest in the whole sample. I did not see this in the study though, did I miss it or was it not mentioned?

'Beer and skittles' is a very strange phrase for Americans. lol

T-Rex is like Elvis. They both are and always will be The King!!🤴 Ahuh, Ahuh....yay, yay, yay!!🕺👍

Xenosmilus and the American Lion are my absolute favorite cats, particularly the Xenosmilus. Those teeth and that size, it had to be doing something absolutely wicked, maybe something we haven't really seen before, or perhaps something we have seen just dialed up to 11. Has there been any isotope analysis done on what it was eating? Could it maybe have been a specialized crocodilian killer? It seems to have the build and weaponry. Maybe the bite force isn't quite there? For whatever reason that's how I picture it. Prowling in undergrowth along creeks and rivers, exploding out towards its crocodilian prey, much like a Jaguar.

Great video! Thanks for your hard work and debunking a lot of the misinformation with actual facts

At a glance this morning, this video thumbnail looked like "Melania: The Real Story", and I thought the picture looked appropriate.

The thing that interests me now is a sort of cultural blitzkrieg. The first Native Americans were either sea faring or had lived in isolated pockets in Alaska for centuries. Neither of which would have had the know how to routinely hunt large megafauna. Clovis clearly represents a massive cultural shift and it’s at the time the largest megafauna went extinct. Maybe it’s a coincidence or maybe this culture became so successful because they learned how to hunt the megafauna successfully thus leading to their explosion in numbers and the spread of their culture.

One day, there will be a place on Earth that will sanction real fights between top predators. Once there are enough fights, we will have good data to determine which animal is the strongest. I would like to remind readers that the Spanish fighting bulls are proven killers of both bears and lions Anyway, both big bears and big cats make impressive taxidermy mounts or simple rugs. They will look good in museums or even private homes.

If you’re ever in the woods and stumble upon me fighting a Siberian Tiger and an Ussuri Brown bear, help the Tiger and Bear…

Love your digression into average body mass vs. maximal. Maximal tells us rather very little about an animal's functional ecology, but average body mass gives us a huge window into understanding how an animal interacts with its environment and other animals. It's very much one of the things that spurred my research into the thylacine's body mass; the values given in the literature just didn't make any damn sense when I started looking at the actual specimens. It's like trying to understand humans by using Andre the Giant as the data point.

@realpaleontology please do amphicyon

This is why I love science and hate politics. A scientist proposes a reasonable idea. A dissenting scientist gathers data from a vast number of groups, empirically demonstrates the hypothesis to be false, and then praises it for its validity while simultaneously acknowledging the core of truth within it. Academic, respectful, and clean. Beautiful.

Tigers would be breakfast for grizzly, Kodiak, black and Polar bears. Tigers don't stand a chance.

Ive watched this 5 times. That's why i say you're the Greatest Of All Time. Or GOAT for short.

The only way human hunting led to mammoth extinction would be to admit to an advanced culture spanning entire continents in wgich there was a trade in mammoth meat and they were harvested on an idustrial scale. Hypothetical testing would be evidence of meat preservation methods such as smoke houses or salt mining. Otherwise i woukd assume their extinction is not directly human related.

*sabre

fascinating! yet another great video. Would you mind analyzing Clouded leopards teeth? They are the closest to saber teeth as we have right now. I know they are not really, but how close are they?

10:52 "...8.4% of the 743 bear scats analyzed." Shouldn't that be tiger scats?

I have some thoughts on this: Modern cats have to tear off chunks of meat by biting with their cheek teeth. With saber teeth in the way, it would be easier to feed with front teeth that protuded forward. Also, with this type of tooth structure a cat could tear off hunks of meat faster which could be useful in a place like africa or ice age north america where there are numberous other predators who want to steal your kill.

Hail to the King, baby!

Deserve more subscribers.

I know why…. No veterinarians with dental 🦷skills!?!?!🤔🤦🏽‍♂️🤣🥸

Great video Steve….. keep-em coming

Did gorgons hunt dicynodonts or just paraeisaurs like scutosaurus?

good video 😎

good stuff! I recall reading the hyena (including kin) are NOT supremely adapted for bone crushing (just very good), and crack teeth, etc, on occasions (inc prehistoric varieties). The Borophagus/bone crushing dogs of north america were a little better at it, or so I read or heard. Any chance to do a video on that family of extinct dogs? Epicyon, Aelurodon eta all await! for reference (& your updates or comments) ua-cam.com/video/yJenvpa3wVs/v-deo.html edit: re-watched, and it was bone crushing DIRE WOLVES that weren't as good at it, breaking teeth sometimes. Still would like something on bone crushing dogs, not a ton out there on them

Can you make a video about Nimravids and Barbourofelis the cat like animals?

please come back to the brains

nice! I'd prefer a bit more depth in each video, but I get that you are following you tube's artificial selection...so I'll ask for MORE such videos instead

cool video, and it certainly is an area with lots of questions & need for exploration & double & triple checking

In half a second I can think of : walrus, warthog, hippopotamus

Thanks again for your lucid explanation. Somewhere I had seen the Clouded Leopard (Neofelis nebulosa) presented as a living sabre-toothed cat and when I just checked at Wiki, the canines on the skull image certainly looked impressive, but clearly conical and not flattened like a true sabre-tooth (more an estoc-toothed perhaps). The Wiki page also has an image with a pretty impressive gaping mouth, though. Has anyone studied how the Clouded Leopard kills its prey?

If you factor in the climate, human and geological factors the US would be far more dangerous than Australia. Also you can outrun a spider and a snake but not a Bear. The west coast of the US is seismically active, Australia is not. As for climate. Australia’s deadliest threats are heat related which includes bushfires. They also get bad flooding and Tropical Storms As for the US take your pick of what dangerous climate you want depending on where you live, Tornadoes, Hurricanes, Flooding as well as the same heat related threats that OZ has including obviously wild fires. On top of that you have the added threat of extreme cold which doesn’t exist in Australia including Blizzards and Ice Storms as well as very low temperatures.

1 advantage is aesthetics. We tend to choose more beautiful/handsome mates. Unfortunately, it’s taboo to explore this subject.

You deserve more subscribers but you got one more from me brother 🙏🏽🙏🏽🙏🏽

In some areas where Tigers meet the larger Brown bears they make regular kills of juvenile or female bears. Mature and larger male Brown bears weighing twice the weight of the Tiger are avoided by the cats .

I have come to find the Permian and Early Triassic Synapsids way more interesting than the Dinosaurs. The Dinosaurs are big and flashy. But these Synapsids. They got character. And are the true allstars in my book.

I can’t imagine homotherium hid those enormous teeth inside its mouth.

Fascinating video. I'm wondering how much those extra-long claws of the sloth bear make a difference in a fight? They're specialist diggers which probably means their forelegs are stronger than other bears of similar size that don't dig as much. I don't have the strength data of this species to draw any definite conclusions, but if they do have a lot of upper body strength combined with those claws it makes sense they'd be a formidable opponent when defending themselves. Add the highly aggressive temperament...

This is why I subscribed, thank you!

5:45 not really prehistoric predators did a biomechanical test on this and the belly biting was deemed unlikely, the lower jaw got in the way

Agreed/makes sense to me...and you didn't even cover the long legs (as they are long), body, etc. I've gotten confused by the endless contradictory studies on these guys, but I've also figured out why: plenty if scientists are hacks & /or frauds, and even among worthwhile ones, there are some contrarians that are contrary for the sake of being contrary. Anyone that makes claims about "primarily a scavenger" lose all respect from instantly anymore. There is no such thing among large critters, which doesn't preclude there EVER was, but it would require incredible evidence to make such an incredible claim. Predators scavenge. Big, and or numerous ones will often steal kills. It's not that complicated or hard to understand...now I'd get a general public shmoe thinking "scavenger, like a spotted hyena", but any scientist (in fields relating to animals in any way) not understanding hyenas are deadly & skilled HUNTERS, ie they disprove the notion...well, they don't deserve the designation (or any profession respect).

Loved the video!

Several people here are postulating that Thylacosmilus was an insectivore, but I don't see it. It seems to me that the development of oversized canines would correlate with "going big" in terms of prey choices rather than "going small," but I'm just taking a logical guess at that. It seems to me more likely that Thylacosmilus would do something like sneak up on sleeping/dozing megafauna, take an aggressive bite at the belly, retreat, let them bleed out, quickly go for the guts once they died, and then leave the rest to others. It would act a bit like a hit and run predator of larger animals...sort of a like cookie cutter shark or the way Komodo dragons deal with larger animals like water buffalo or deer.

Quinkana were another good reason for her to drag prey up a tree

I always found Xenosmilus fascinating, the Florida freak, standing out for breaking the rules, or rather, overturning our assumptions. I hadn't known of the Venezuelan or south american variants ( homotheriums as I'd heard), and certainly not that they were much larger still. Surely varieties ranged the entire arc of southern north america & northern south america (though you seem one especially allergic to obvious inference over direct evidence, absolute proof only), but I'm not...where the terrain/vegetation/ecosystem was favorable in between, they did go

Prof steve Do you agree with me on these topics 1. Tiger muscle mass Tiger fat accounts provide two sources which both provides it around 13.3 and 13.8% and by taking the avg of these we get 13.5% fat. So by doing simple math and accounts on tigers skin and fur,skeleton and organ weights We will get 57% muscle in which the organs comprises around 7% the fur and skin is around 10% skeleton is around 12.5% and the fat is around 13.5% as I mentioned earlier. 2. 1) Study: Bertram and Biewner, 1990. Metric: ML diameter of humerus at midshaft in relation to humeral length. Correlated With: Resistance of humerus to stresses along the ML axis. Sample Size: 4 lions, 2 tigers. Lion: 8.92%; 12.78% Tiger: 8.57%; 11.37% Edge lion 2) Study: Christiansen and Harris, 2005. Metric: ML diameter of humerus at midshaft in relation to humeral length. Correlated With: Resistance of humerus to stresses along the ML axis. Sample Size: 3 lions, 5 tigers. Lion: 8.97% Tiger: 8.70% Edge: Lion. 3) Study: Meachen-Samuels and Van Valkenburgh, 2010. Metric: ML diameter of humerus at midshaft in relation to humeral length. Correlated With: Resistance of humerus to stresses along the ML axis. Sample Size: 2 lions, 2 tigers. Lion: 8.24% Tiger: 9.09% Edge: Tiger. 1) Study: Christiansen and Adolfssen, 2007. Metric: Least circumference of humeral diaphysis in relation to humeral length. Correlated With: Overall resistance of humerus to stress. Sample Size: 17 lions, 15 tigers. Lion: 31.8% Tiger: 30.3% Edge: Lion 2) Study: Christiansen and Harris, 2005. Metric: Least circumference of humeral diaphysis in relation to humeral length. Correlated With: Overall bending strength of humerus. Sample Size: 3 lions, 5 tigers. Lion: 31.4% Tiger: 30% Edge: Lion. Study: Christiansen and Harris, 2005. Metric: AP diameter of humerus at midshaft in relation to humeral length. Correlated With: Resistance of humerus to stresses along the AP axis. Sample Size: 3 lions, 5 tigers. Lion: 10.98% Tiger: 10.37% Edge lion So does this means the lions have better grappling abilities and tigers can accelerate faster

*True, with anti-venom Australia is way more safe, in USA there are grizzlies, wolves, cougars, jaguars, black bears, but these won't bother you unless you are outside of house, but insects will.**

by the way Doc i love your videos thanks for putting these on