I congratulate Todd for his extensive knowledge presented in this video. I have been studying mass extinctions over the past dozen years because I was impressed with the massive size of some dinosaurs. The result was a theory I wrote to explain the gigantism of these fauna and why they became extinct. The theory is called ‘The Gravity Theory of Mass Extinction.’ The underlying principle is that the Earth’s core elements can move off-center if large surface mass on the Earth moves to high latitude. During the Mesozoic that surface mass was Pangea. During the recent Ice Age(s) the mass that moved to high latitude was ocean water that transferred to the polar regions. The off-centering of the Earth’s core elements was a result of the Law of Conservation of Angular Momentum. Clearly the off- centering would result in lower surface gravity on one part of the globe and a commensurate increase in surface gravity antipodal to the region with lowest surface gravity. A global gravitational gradient occurred. Because the region with the lowest surface gravity during the Ice Age(s) depended upon the longitude of the location of the most massive polar ice accumulation, the region with the lowest surface gravity was not fixed. This would explain why the Australian megafauna developed and became extinct much earlier than the North and South American megafauna. During the periods when the polar ice melted (leading to an interstadial) surface gravity in the region with lowest surface gravity increased to near current value causing the extinctions of megafauna that evolved during the earlier period of lower surface gravity. Toward the end of the Pleistocene mammoths were decreasing in size as well as the bison. I published a book ‘Ice Age Extinctions, A New Theory’ that explains the above comments.
And why dont you find Clovis sights? if I'm walking along and loose my pocket knife and you come along later are you going to leave it laying there or pick it up and use it
People have been hunting bison for as long as they've been hunting mammoths... How did the bison squeak by 25% smaller and live until this day, but all the mammoths and sloths, giant beaver, horses, camels and so on, were "hunted" to extinction?
Keith R, mammoths and bisons are two very different species with different needs and different life cycles and birth rates - just like today´s wildebeest and elefants. Wildebeest are still numerous while the numbers of African elefants are plummeting because of poaching and habitat destruction. The same might have happened with mammoths and other mega fauna species.When the last ice age ended, the conditions were not ideal anymore for these beasts, and the arrival of increasingly skillful and numerous human hunters may have been the last straw which led to the eventual extinction of mammoths. And the hunting methods of these pre-historic hunters might have accelerated the demise of the mammoths.
@@headlessspaceman5681 Birthrate and the time needed to mature and independent. The bigger the animal the less abunndant - so there were less individuals at time "zero" to evolve. Moreover, elephants and mastodonts are słower. they cannot jump, there are clumsy what makes them eastern target. However there were dwarf mammoths and other elephants - on Islands ( Channel islands, Wrangl Island, Cyprus). They all died out just after men came to these islands.
First of all there is no way tell how many mammoths, etc survived the Ice Age. We don't know how many people existed at the time. One mammoth is a lot of meat and could sustain a small tribe for a year plus they would still hunt other animals for fresh meat to augment their diet. So how many mammoths and other large animals did they kill in that time frame and how many died from other predators. Secondly, how many young were removed from the herd by other predators? How many kill sites were destroyed by scavengers, normal decay and/or the weather? How ling does a 'Road Kill' site last. So any theory without these factors taken into consideration will always be an un-provable theory. As for a comparison to today; tell me, how many kill sites of deer, moose, beaver, etc do you know of or can find today? And we know there are hundreds of thousands of them. How many bear skeletons have been found or can be found in the wild today? None or next to none and that is without hardly any time passing plus a grizzly bear is no small animal. So my point is - these archaeological theories will always be 'dead in the water' because we can't even prove today's hunting activities - if it wasn't for film and digital images and the knowledge of the hunter but his knowledge is only hearsay to others and isn't proof that will last for hundreds of thousand years and definitely will not be provable by archaeologists hundreds of thousands of years from today. Still the archaeological facts are amazing. The theories are only entertainment. Unless through some chance there happens to be DNA from all of the extinct animals discussed in the video to test for a possible viral link. That is about the only provable argument.
North America is a huge continent. It’d take a pretty significant blast to take out that legs an are. Why no blown down trees like in Tunguska? And that is a relatively small blast.
I imagine this kid has changed his mind in his young "career" a few times since he changed it the first time.. an ever-changing climate is a fact of life on earth, nothing is static, Local Flash floods erasing everything in sight, volcanoes covering mass areas, and sea level rise reshaping the coast lines are known events, just how many species went extinct during Roman times due to overkill for entertainment in the empires many many colliseums, Modern extinctions are rampant with our overkill practices as well as our self inflicted environmental poisonings and of coarse habitat loss du to development. Humans are adaptable to a fault, and for our size we can breed like rabbits and eat like gluttonous famished dogs. without agriculture civilization would have never came to be. we like all the edible sources of food would be already extinct the only exception is the oceans bounty, and even that resource is now threatened by over harvesting and of coarse pollution, our weakest form of ignorance & lack of intelligence.
I congratulate Todd for his extensive knowledge presented in this video.
I have been studying mass extinctions over the past dozen years because I was impressed with the massive size of some dinosaurs. The result was a theory I wrote to explain the gigantism of these fauna and why they became extinct. The theory is called ‘The Gravity Theory of Mass Extinction.’
The underlying principle is that the Earth’s core elements can move off-center if large surface mass on the Earth moves to high latitude. During the Mesozoic that surface mass was Pangea. During the recent Ice Age(s) the mass that moved to high latitude was ocean water that transferred to the polar regions. The off-centering of the Earth’s core elements was a result of the Law of Conservation of Angular Momentum. Clearly the off- centering would result in lower surface gravity on one part of the globe and a commensurate increase in surface gravity antipodal to the region with lowest surface gravity. A global gravitational gradient occurred.
Because the region with the lowest surface gravity during the Ice Age(s) depended upon the longitude of the location of the most massive polar ice accumulation, the region with the lowest surface gravity was not fixed. This would explain why the Australian megafauna developed and became extinct much earlier than the North and South American megafauna.
During the periods when the polar ice melted (leading to an interstadial) surface gravity in the region with lowest surface gravity increased to near current value causing the extinctions of megafauna that evolved during the earlier period of lower surface gravity.
Toward the end of the Pleistocene mammoths were decreasing in size as well as the bison.
I published a book ‘Ice Age Extinctions, A New Theory’ that explains the above comments.
And why dont you find Clovis sights? if I'm walking along and loose my pocket knife and you come along later are you going to leave it laying there or pick it up and use it
Why does it have to be one or the other.. a combination of two or all of these ideas is probably more realistic
Prey naivete...I think not, come rope a domesticated horse 3 times watch how smart they get
People have been hunting bison for as long as they've been hunting mammoths... How did the bison squeak by 25% smaller and live until this day, but all the mammoths and sloths, giant beaver, horses, camels and so on, were "hunted" to extinction?
Keith R, mammoths and bisons are two very different species with different needs and different life cycles and birth rates - just like today´s wildebeest and elefants. Wildebeest are still numerous while the numbers of African elefants are plummeting because of poaching and habitat destruction. The same might have happened with mammoths and other mega fauna species.When the last ice age ended, the conditions were not ideal anymore for these beasts, and the arrival of increasingly skillful and numerous human hunters may have been the last straw which led to the eventual extinction of mammoths. And the hunting methods of these pre-historic hunters might have accelerated the demise of the mammoths.
Birthrate is the answer to your question
@@headlessspaceman5681 , yup!
@@headlessspaceman5681 Birthrate and the time needed to mature and independent. The bigger the animal the less abunndant - so there were less individuals at time "zero" to evolve. Moreover, elephants and mastodonts are słower. they cannot jump, there are clumsy what makes them eastern target.
However there were dwarf mammoths and other elephants - on Islands ( Channel islands, Wrangl Island, Cyprus). They all died out just after men came to these islands.
First of all there is no way tell how many mammoths, etc survived the Ice Age. We don't know how many people existed at the time. One mammoth is a lot of meat and could sustain a small tribe for a year plus they would still hunt other animals for fresh meat to augment their diet. So how many mammoths and other large animals did they kill in that time frame and how many died from other predators. Secondly, how many young were removed from the herd by other predators? How many kill sites were destroyed by scavengers, normal decay and/or the weather? How ling does a 'Road Kill' site last. So any theory without these factors taken into consideration will always be an un-provable theory. As for a comparison to today; tell me, how many kill sites of deer, moose, beaver, etc do you know of or can find today? And we know there are hundreds of thousands of them. How many bear skeletons have been found or can be found in the wild today? None or next to none and that is without hardly any time passing plus a grizzly bear is no small animal. So my point is - these archaeological theories will always be 'dead in the water' because we can't even prove today's hunting activities - if it wasn't for film and digital images and the knowledge of the hunter but his knowledge is only hearsay to others and isn't proof that will last for hundreds of thousand years and definitely will not be provable by archaeologists hundreds of thousands of years from today. Still the archaeological facts are amazing. The theories are only entertainment. Unless through some chance there happens to be DNA from all of the extinct animals discussed in the video to test for a possible viral link. That is about the only provable argument.
Younger Dryas comet impact event.12,900 years ago caused Pliestocene extinction event.
North America is a huge continent. It’d take a pretty significant blast to take out that legs an are. Why no blown down trees like in Tunguska? And that is a relatively small blast.
How this comet explain extinctiond that took place elsewhere in different time? Why did the mammoths survived on Wrangel Island hm?
I imagine this kid has changed his mind in his young "career" a few times since he changed it the first time.. an ever-changing climate is a fact of life on earth, nothing is static, Local Flash floods erasing everything in sight, volcanoes covering mass areas, and sea level rise reshaping the coast lines are known events, just how many species went extinct during Roman times due to overkill for entertainment in the empires many many colliseums, Modern extinctions are rampant with our overkill practices as well as our self inflicted environmental poisonings and of coarse habitat loss du to development. Humans are adaptable to a fault, and for our size we can breed like rabbits and eat like gluttonous famished dogs. without agriculture civilization would have never came to be. we like all the edible sources of food would be already extinct the only exception is the oceans bounty, and even that resource is now threatened by over harvesting and of coarse pollution, our weakest form of ignorance & lack of intelligence.
Guess what, the Clovis peoples went extinct too at this time.