https://www.youtube.com/watch?v=Knli1lsOm4A
Due to some extinct mammals have no definite present-day relatives, they are compared to living mammals by the their appearancesmya: million years agoAlticam

https://www.thoughtco.com/biggest-prehistoric-mammals-1093359
The 20 Biggest Prehistoric Mammals. By. Bob Strauss. Updated on December 21, 2018. Although the biggest prehistoric mammals never approached the size of the biggest dinosaurs (which preceded them by tens of millions of years), pound for pound they were a lot more imposing than any elephant, pig, hedgehog or tiger alive today. 01.

https://ourplnt.com/largest-prehistoric-mammals/
Largest prehistoric mammals: Hippopotamus gorgops vs Hippopotamus amphibius vs 1.8-meter-tall human size comparison. The largest known Even-toed ungulate (artiodactyl) was Hippopotamus gorgops with a length of 4.3 meters (14 feet) and a height of 2.1 meters (6.9 feet).

https://en.wikipedia.org/wiki/Largest_prehistoric_animals
The largest prehistoric animals include both vertebrate and invertebrate species. Many of them are described below, along with their typical range of size (for the general dates of extinction, see the link to each). ... Size comparison of some species of Edaphosaurus. ... cynodonts close to mammals. It is known by a right lower molariform 3.3

https://www.youtube.com/watch?v=AtVGwHPzyNc
The long awaited and much demanded sequel to my dinosaur size comparison.Support the channelhttps://www.patreon.com/DPavitthttps://www.ko-fi.com/danepavittEp

https://assets.press.princeton.edu/chapters/s10850.pdf
A small number of horses, musk deer, birds, and other mammals from the middle Miocene of Nebraska were also trapped and fossilized. 7. Mammals have been the largest and most dominant creatures on the planet ever since all the dinosaurs—except for their bird descendants—vanished 66 Ma (million years ago).

https://www.youtube.com/watch?v=KKoZVDouK6g
Size comparison of some prehistoric mammals. 1. Woolly Mammoth2. Woolly Rhinoceros3. Megaloceros Giganteus4. Cave Bear5. Cave Lion6. Cave Hyena7. Elasmotheri

https://www.thoughtco.com/prehistoric-mammals-4133369
Find profiles of prehistoric mammals, including the first mammals that co-existed with the dinosaurs, saber-toothed cats, prehistoric dogs, and the giant mammals of the Cenozoic Era. ... 10 Steps of Animal Evolution. Facts About Leviathan, the Giant Prehistoric Whale. 250 Million Years of Turtle Evolution.

https://www.newscientist.com/article/mg19325891-600-prehistoric-mammals-big-bad-and-furry/
Though Repenomamus weighed only 5 or 6 kilograms, that was still around a hundred times heavier than early mammals were supposed to be - comparable to the size difference between humans and the

https://www.nature.com/articles/d41586-018-05134-9
The unexpected discovery of a nearly complete skull from the Early Cretaceous epoch that has been preserved in three dimensions provides profound insights into the evolution and biogeography of

https://www.nytimes.com/2017/03/17/science/prehistoric-megafauna-large-animals.html
Because of recent extinctions, there are certainly fewer large, or megafaunal, species alive today, Dr. MacPhee said. "In North America, we are down to about a dozen megafaunal mammal species

https://www.bbc.com/future/article/20230123-why-prehistoric-giant-animals-got-smaller
In part, this is because of body heat and metabolism. Larger animals have a bigger surface area to volume ratio, meaning that an elephant, for example, has more volume compared to the surface area

https://gagebeasleyprehistoric.com/lists/biggest-prehistoric-mammals/
Modern rodents are the smallest mammals around, but they have some pretty big ancestors. One of such massive rodent ancestors is the Josephoartigasia, which lived in South America from the Early Pliocene to the Early Pleistocene Epoch.. The skull of this giant rodent was as big as that of a beef cow, and its entire body measured up to 2.6 meters (8 feet 7 inches).

https://www.fossilera.com/pages/the-largest-prehistoric-animals
The largest prehistoric animals chronicled in stone from dinosaurs to the largest sea scorpions. Customer Service: (866) 550-2013 ... Size comparison of six of the largest eurypterids (sea scorpions). ... 2 giants with very scant remains make up the contenders for the biggest mammals. That being the extinct elephant Palaeoloxodon namadicus, and

https://www.britannica.com/animal/woolly-mammoth
Woolly mammoths were largely extinct by about 10,000 years ago, due to the pressures of a warming climate (which reduced the habitat of these cold-adapted mammals) combined with hunting by humans. Scientific evidence suggests that small populations of woolly mammoths may have survived in mainland North America until between 10,500 and 7,600 years ago.

https://www.boredpanda.com/digital-art-animals-prehistoric-fauna-ancestors-past-present-roman-uchytel/
Yes and no. There was a moment in time where oxigen levels were higher, allowing animals like insects to be big (like the Carboniferous). But its not the case here. Most of this animals got extinct as a combination of prehistoric human hunting and the end of the ice age.

https://www.ign.com/articles/digital-illustrations-prehistoric-animals
Paleoartist Roman Uchytel has created a gallery of size-comparison images that highlight the radical evolutionary journey that modern day animals have undergone when compared to their long-extinct

https://themindcircle.com/size-comparisons-of-animals/
Artist Roman Uchytel brings together prehistoric animal ancestors and their modern relatives by using photoshop. He shares his works on Prehistoric Fauna and here are 37 of the size comparison of prehistoric animals and their modern relatives. More info: twitter.com | prehistoric-fauna.com | Facebook | Instagram.

https://mymodernmet.com/prehistoric-fauna-roman-uchytel/
Giant Andean Condor Can Fly Without Flapping Its Wings for Over 5 Hours. Scientists Discover Fossil of Prehistoric Whale With Legs and Killer Teeth. Brazil Is Home to Prehistoric Underground Tunnels Created by Giant Ground Sloths. Scientists Discover a 17,000-Year-Old Woolly Mammoth Roamed Enough to Circle the Earth Twice.

https://www.reddit.com/r/NatureIsFuckingLit/comments/1clk8bw/the_size_comparison_of_prehistoric_animals_and/
After a large-scale devastation it can take millions of years for giant animals to reappear—it took 15 million for the giant mammals to crop up after the dinosaurs died. The last major extinction event took place roughly 12,000 years ago, not nearly long enough ago for new species of truly massive animals to have materialized by now.

https://www.youtube.com/watch?v=r7AYGM1WMKo
Thanks for Watching.If you Enjoy this video, Subscribe to watch more Videos to Come.Charactor and Animation Artist: Macevele hlavuteloContact me at : hlavute

https://prehistoric.fandom.com/wiki/Prehistoric_Animal_Sizes
File:Maximum estimate size comparison by harry the fox-d60djyx.jpg A list of prehistoric mammals over 10 metric tonnes. Basilosaurus (38.6-?60.2 tonnes/ 40-60.8 tons) Basiloterus (30-?40 tonnes... Prehistoric Wiki

https://a-z-animals.com/animals/shark/shark-facts/prehistoric-sharks/
A comparison of the minimum (top) and maximum (bottom) size estimates of Ptychodus. Image credit from PLOS ONE. ©Jambura PL, Kriwet J, CC BY 4.0, via Wikimedia Commons - Original / License. Ptychodus was one of the largest prehistoric sharks, with some estimates placing its size up to 33 feet in length!

https://www.forbes.com/sites/scotttravers/2024/06/19/7-incredible-facts-about-the-titan-boa-the-largest-snake-ever-discovered/
Other extant animals in that weight range, for a point of comparison, include the hippopotamus, walrus and American bison. ... crocodilians and possibly even early mammals. Its size and strength

https://www.youtube.com/watch?v=gx_fg6xoi_A
The values presented are estimations according to various sources, all of which are listed below.Enjoy this size comparison video. Don't forget to subscribe,

https://www.haaretz.com/archaeology/2024-06-19/ty-article-magazine/israeli-scientists-show-definitively-humans-were-responsible-for-megafauna-extinction/00000190-2fbb-d700-a7f0-affbb2ef0000
Add to the mix that the bigger the animal, the longer its gestation and childrearing. Mouse pregnancy usually lasts around 20 days, cats gestate for about 45 days, goats for 150 days, humans for nine months and elephants have the longest gestation period of any terrestrial animal at, on average, 22 months.Also, large animals don't litter: they have one or maybe two children at a time.