Imagine you’re a hunter-gatherer in South America, just doing your thing, hunting deer or something and suddenly you come upon Arctotherium, just a giant beast. Terrifying!
Well if that scenario happened, the guy might have been one of the first peoples in South America, who happened across one of the very last of these gigantic bears!
These bears were highly omnivorous. So were many large mammalian ''predators'' including the terror pigs. The largest mammalian hypercarnivores were significantly smaller: the hyenodonts and later the big cats. We can't compare them to the mighty predators of the Mesozoic
Great video. Would love to see a future one on the American Lion and a size comparison between the American Lion and Arctodus Simus. So cool to think people encountered these in the past.
I'm usually a part of the therapod gang, but I really like the idea of a miniature sauropod. Something like 4 - 6 feet long. Maybe a magyarosaurus with dwarfism or bred to be smaller.
Love it! Ice age mega fauna is one of my favorite subjects! Would love to hear your thoughts on the YDIH & if you believe it’s nonsense, why? Id love for someone to actually refute the hypothesis with rational, logical, factual evidence as opposed to using logical fallacies.
Arctotherium is just a big lovable teddy bear 🧸! As long as they're well fed ... About keeping dinosaurs: I have a book that has all the information on keeping many different types of dinosaur. It also has side notes that a really quite useful, such as: Worryingly intelligent. Worryingly stupid. Likes children. Likes to eat children. Extremely flatulent. These are just some of the quick tips.
Actually the biggest reason why mammals don't get as large as dinosaurs isn't because of our bones. It's because of our metabolism. Mammalian metabolisms are much higher than most other animals. If you scaled up an elephant to the size of a sauropod, It would cook itself from the inside out with its own body heat.... It took a lot of evolution for sauropods to get as big as they were and this included massively slowed down metabolisms. Whales have extremely slow metabolisms by mammalian standards but they also have the aid of the water to cool down their bodies.
@@juritudi57yearsago59 Theropoda today have a higher metabolism than mammals. All dinosaurs, including the mighty titanosaurs, have growth rings pointing to a metabolism as fast if not faster than mammals. They had an extremely fast growth spurt only possible with a very high metabolic rate which even mammals can't match. Trex lived in an enviroment with 2 ceratopcian species that were larger than Bush elephants [largest terrestrial mammals today], 2 ankylosaurid species as large as Asian elephants, an ornithopod as large as bush elephants [and with herds larger than any mammal ever had, including bovines],in addition a land whale Alamosaurus. On top of that, trex was a hypercarnivore, it wasn't omnivorous like the south American flat faced bear. Dinosaurs were better as being bigger and stronger, and this allowed for giant carnivores to evolve, and they needed to in order to keep up.
Whhh, the very high estimates for Arctotheroum came from scaling an individual with fractured femur that reheated, resulting in an artificially high estimate, that and scaling from overweight captive bears. Volumetric studies suggest more conservative weights for the fluffy boys
I have had a lot of different kinds of animals over the years as pets, and reptiles seem to have the least personality. I had snakes, lizards and turtles and they do have different temperaments, but I never felt like they could learn much of anything.
My zoo has 3 Alaskan male brown bears that each weighed over 1000 pounds. They are super intimidating but it’s crazy this bear was bigger than all 3 combined 😳
I have to agree that mammals are very dense. Some of the densest mammals I know are my co-workers, especially the one guy who thinks aliens built the pyramids.
I am always surprised how people who believe outlandish, absurd theories, can be so practical and technical when it comes to clandestine, hydroponic horticulture
Besides size and body density the body plan for bears in general is extremely stable, robust and agile. So, when you pit the short faced bear against similar sized therapod dinosaurs the bear might actually be much more adept at wrestling them, knocking them over and disabling their limbs. Bears are practically built specifically for wrestling and shredding their opponents in the process
Particularly if the T-Rex was one of a mating pair. The one thing which might have made it stop and think about attacking a bear, was the bear’s capacity to inflict serious injury.
@@ilokivi A Trex would have absolutely no fear of a bear inflicting damage. A 10 ton hypercarnivore would EASILY take out a 2 ton omnivore. Hypercarnivores make a living off death, omnivores like arctotherium avoid injury and preferred vegetables
Depends on the theropoda. Some theropoda, like carnotauridae, were built for speed and for catching small prey. Most other theropoda have advantages over bears. Theropoda have several advantages over mammals, this is why mammals lived along side them for 90 million years and they could never, not once, compete. 1. Theropoda have airsacs which are 2.5x more efficient than lungs. So the theropoda has FAR superior stamina. 2. Theropoda are highly muscularized with large muscle attachment sockets. Birds have this today, it makes them very lean and powerful for their size. Theropoda were not small but still very muscularized. A 2 ton theropoda is far more powerful than a 2 ton bear, which would be mostly fat and heavy bone. 3. Theropoda bones are stronger and lighter, superior in every way. This is also a reason why 10lbs birds look far larger than 10lbs mammals. A 2 ton theropoda would dwarf a 2 ton bear in terms of volume.
There’s a great book by Robert Mash called how to keep dinosaurs and it’s an ironic manual on having different species as pets. It’s quite funny and worth a read
I remember seeing a display of this bear at a museum about 10 years ago. Along with Colombian Mammoth and other animals long gone. It was awesome. Great video. 👍
The 1600kg-2000kg estimate is massively overestimated based on it being measured from a specimen that has a pathology that increased the bone diameter/circumference. It's more likely that Arctotherium top at around 800kg.
@@lewisbean4250 so you meant to say what the experts believed to be the largest bear ever discovered is smaller than the largest polar bear? because that's what he said.
I think the main issue would be if a dinosaur filled a similar niche or a larger niche. These large bears were not good at climbing trees, if a large theropoda looked at it funny the bear would be doomed. Mammals in the age of dinosaurs could hide underground, this bear could not. This bear was also not good at climbing trees.
I don't know. Today's most common pets are small carnivores (dogs and cats), so I'd say things like compsonathids, small dromeosaurs and the like. Though since dinosaurs weren't likely very social, they'd behave closer to cats.
Another nice video. Thanks! I do like the viewer's Q&A segment. If I had a big place in the countryside, I'd like to have some kind of Ceratopsian. If I could have a mammal, my pick would be a rhino.
Archaeopteryx, Eoraptor, certain tiny pterosaurs, Protoceratops could be like a sheep or pig, and maybe that dinosaur from Madagascar that ate fish could work also
Sure, scare most dinosaurs in its weight class, a T-Rex was 16.5 Tons and that goes up if we consider they think the upper size could be 70% larger than previously thought. That would be like Peter Dinklage intimidating Tyson Fury.
An average trex WAS NOT 16.5 tons. Maybe, maybe a couple dozen throughout their entire history. You could just say 7 tonnes, which is an average trex, and still get the same effect. That's like saying the average grizzly bear is 1200 pounds, or the average elephant is 13 tons. Yes is possible, but you will likely never see it
I mean seriously, how many shaqs, or Brian shaws, or Robert waldlows have there been? And there have been BILLIONS of us. There probably weren't even a hundred million full grown tyrannosaurs ever
@@rickeytaylor3001 "bullshit if u look at it deep we don't know how big these animals actually got" - if you don't know, why did you put a figure on it? Who's talking bullshit here?! Well done contradicting and exposing your own made up tripe Muted.
Mammals do get as big as some dinosaurs such as Ceratopsians, Hadrosaurians, Theropods, and much much more they just never reached sauropod or giant hadrosaur/theropod sizes
Bearing in mind the average dinosaur was about the size of a deer, it's fair to say that mammal can get as big as quite a lot of dinosaurs. My cat is as big as some dinosaurs.
Mammals weigh more than reptiles. In a simulation by Gojicenter between T. Rex and the largest mastodon, the elephant won. Regarding short-faced bears, as Joe Rogan said, while they were alive they may have been the reason humans did not cross the Bering Straits. Can you imagine these things hunting you?
