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Dinosaur news
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@johnny rex :
About #165: the link you gave... https://allthatsinteresting.com/t-rex-true-size Yes interesting but, for the moment, only purely speculative. At first supposing that 2,5 billion of t.rex roamed the Earth, and from that of course it's very easy to state we know nothing about T-rex. I don't know but this number of 2,5 billions of T-rex having roamed through the Earth (for the moment only a part of the North America continent, Alberta and Montana essentially) during 2-3 millions years. We are speaking about an apex predator... this figure seems a little too overestimated... Personally I don't believe at all "a 5 tons T-rex" when we are depicting an adult t-rex. It is said a spinosaurus could weigh 15 tons. It's absurd if we compare both skeletons, T-rex and spinosaurus. Spinosaurus close to a t-rex is a gracile theropod. He certainly didn't weigh more than 10 tons. In this case t-rex could have weighed 12 tons easily. Your link speaks about a 33.000 pounds t-rex... Why not ? The fact is: the fossilization is an exceptional event. And because of that we don't know yet anything about dinosaurs. We're only speculating about exceptional events.
" How smart were dinosaurs? Were dinosaurs as smart as primates? The debate over theropod intelligence is a continuing one, with factors like EQ and neuron density competing for respect in the scientific community. With isotropic fractionation, we learned that it's possible for dinosaurs as smart as primates to have existed. Megatheropods may have been among the most intelligent dinosaurs. How smart was T.rex? T.rex, if its neuron density was similar to those of its close avian relatives rather than nonavian reptiles, could be smarter than a baboon.
Dinosaur intelligence is a constantly shifting science, but a technique known as isotropic fractionation may hold the key to unlocking the secrets of ancient dinosaur brains. Suzana Herculano-Houzel investigated dinosaur neuron density and discovered that some theropods may have been as intelligent as primates and modern corvids, suggesting complex problem-solving, tool use, and culture building even in the world's largest terrestrial predators. " A very interesting video dated from January 2023 about the great variety as concerns the intelligence of the dinosaurs. Indeed the sauropods, ornitischians, and so on were surely "not very bright animals", but as concerns the theropods, it's amazing ! Our famous T-Rex could be compared with the extant ravens. Question: if it was the case, the relation predatory-prey could have resulted as a pure slaugther, couldn'it ?
Small video about the biggest, but not well known, theropod on Earth during the Jurassik period: saurophaganax.
" Saurophaganax maximus was the biggest theropod in the Jurassic Period, but remains relatively obscure despite being the biggest apex predator in North America besides Tyrannosaurus. New data indicates that not only was it a beast in the same league as the biggest megatheropods, but it was a sauropod-hunting grappler with powerful arms, claws, and other adaptations for taking down the giants of the Morrison Formation. This video analyzes Saurophaganax's life, ecology, and size in order to create the new authoritative guide to the animal. Saurophaganax may be a dark horse in the megatheropod race, but it might be bigger than popular giants like Carcharodontosaurus and Spinosaurus when it comes to the largest specimens of each species. Is Saurophaganax different from Allosaurus? Saurophaganax coexisted with other large predators like Torvosaurus and Allosaurus, and may have hunted huge sauropods like the Kenton Giants, Barosaurus, Brachiosaurus, Apatosaurus, and Diplodocus. Including the gigantic specimen Leviathan, Saurophaganax was the second-largest North American theropod, only behind Tyrannosaurus itself in terms of overall mass. "
Life in the Cretaceous: extremes... With the last perfectionnal improvements as concerns the pictures creation, but without any comments. You can notice some analogies with extant biotopes in Africa (for example Etosha, with a t-rex/lion coming to a water point, the herds of herbivors moving away from its path).
And of course, the final explosion and the megafauna extinction... " 9 déc. 2023 Travel back 66 million years and immerse yourself in the dinosaurian world of the late cretaceous period, a time both strange and familiar. In this episode we'll be exploring the extremes of planet earth, where life is tested to the limit. Life in the Cretaceous is a fan-edit of Prehistoric Planet inspired by Moving Art, featuring no narration - only music and the sound of nature itself. The edit combines scenes from a variety of episodes from Prehistoric Planet as well as other BBC nature series (such as Frozen Planet II) to create a more diverse overview of the flora and fauna that thrived at the end of the cretaceous.* *Some shots have been picked for completely superficial reasons, as the exact species may not have lived back then but almost certainly something much alike. "  (05-08-2024, 03:17 AM)Spalea Wrote: Life in the Cretaceous: extremes... With the last perfectionnal improvements as concerns the pictures creation, but without any comments. You can notice some analogies with extant biotopes in Africa (for example Etosha, with a t-rex/lion coming to a water point, the herds of herbivors moving away from its path). It's really good film. And the music is something unusual and so relevant.
After having posted the T-rex's sound into the " T-rex " section, here are a few different Cretaceous reptiles' vocalization. But always without explanation at all. Accepting it or not.
Dinosaurs vocalizations study with more examples. It's said that dinosaurs owned a larynx and that they could produce some sounds much closer to extant animals than we thought.
" 0:00 Intro 0:22 Triassic Period 6:01 Jurassic Period 12:52 Cretaceous I 20:49 Cretaceous II 26:30 Cretaceous III An ongoing study utilizing the most recent scientific data on dinosaur vocalizations. Sounds are produced by myself and digitally workshopped from modern non-syrinx based avian reptiles. Using skull and olfactory cavity proportions, one can attempt to recreate the flow of sound, frequency, and volume of each animal. Much study is required for each particular species, and often several phases are trashed due to general unlikelihood. The final results are based on acute representations of what sounds would be most comfortable and base-line for each animal. Video also includes other reptiles, even though they are much more difficult to produce accurately. "
Numerous mysteries concerning the megaraptors classification and their apparent links with the other theropods groups such as allosaurids and tyrannosaurids.
" What were the Megaraptor dinosaurs? This mysterious lineage of predatory theropods had massive arms bearing huge claws and rose to prominence towards the end of the age of dinosaurs - but many mysteries still surround them. "
An other video explaining the mystery about this group of theropods, the megaraptors. What surprises me a lot are the very recent controverses, - till 2022 ! - about their classification and the common agreement tending to a very close proximeety with the tyrannosaurids that were nevertheless their exact opposite as concerns their anatomy and their repartition during the Upper Cretaceous period.
The tyrannosaurids evolved towards a maximal efficiency of their powerful jaws, whereas megaraptors evolved toward the weaponization of their forelimbs - the biggest claws ever discovered reaches 45 cm - . And about their repartition, the tyrannosaurids ruled over the Nothern hemisphere while the megaraptors were the Upper Cretaceous absolute masters of the South hemisphere, especialy South Amerika and Australia where the biggest species were discovered, Bahiariasaurus 12 meters long, but dubious because the skeletton was completely destroyed in 1944 by an England air raid, Fukuiraptor and Megaraptor itself 10-11 meters long... " Megaraptora were Predatory Theropod Dinosaurs from the Cretaceous. In this video I take you through the discovery and history of Megarptora; describe them in detail based on up-to-date, reliable studies; Discuss the different genera and species of the family and finally, give you a glimpse into the decade old, ongoing argument regarding the classification of this enigmatic group of Dinosaurs. Ultimately, you will learn that Megaraptora are extremely under-rated Dinosaurs. Our most recent studies describe them as very close relatives to the Tyrannosauridae family, only strongly adapted for the use of their claws as weapons. "
From the actual example of crocodilians alligators, speculations can be made in order to estimate the maximal weight that a "megatheropod" could reach. They don't say they effectively had this weight. But it was possible.
And the "final winner" (the most heaviest) can amaze you, but not that much if we consider it was an ancient theropod converted into a vegetarian animal... " Megatheropods were the most powerful terrestrial carnivores in Earth's long history, and recent studies show that theropods like Tyrannosaurus may have been bigger than expected. The Mesozoic was a beautiful nightmare, and the rulers of that nightmare realm were the megatheropods: bipedal dinosaurs closely related to birds but bigger than African elephants. The elite group includes household names like Tyrannosaurus, Spinosaurus, and Carcharodontosaurus, each of which had unique adaptations that cemented them as apex predators that would be terrifyingly alien to us humans. While other beasts like sebecids, huge bears, and hyaenodonts were fearsome in their own right, none even came close to the level of the megatheropods. But among the most formidable theropods to ever walk the earth, only one species could truly claim the crown of the biggest ever. What was that animal? How big could it really get, and what would its size tell us about its ancient ecosystem? These dinosaurs were the biggest land predators ever. The Mesozoic Nightmare: 00:00 What Is A Megatheropod? 00:43 Did T. rex Just Get Bigger? 00:51 The Biggest Megatheropods We Know Of: 03:48 Deinocheirus mirificus: 04:00 Tyrannotitan chubutensis: 04:43 Mapusaurus roseae: 05:06 Saurophaganax maximus: 05:56 Spinosaurus aegyptiacus: 06:13 Carcharodontosaurus saharicus: 06:53 Giganotosaurus carolinii: 07:28 Tyrannosaurus mcraeensis: 08:18 Tyrannosaurus rex: 08:39 The Biggest Theropod Possible: 10:31 "
How dinosaurs grew ? The extrapolations, how could they been established ? Three tendancies explaining below in this short video.
" Dinosaurs were an incredibly diverse group even discounting the thousands of bird species nested within Theropoda, and they utilized a variety of growth mechanisms and life history strategies that changed according to the animal’s niche. But how do we tell how quickly an animal grew or how old it was when it died? This is where we use histology, or the subfield of biology concerned with studying tissue. Histology can tell us how old dinosaurs were when they died, how quickly they grew, and how they used the resources around them to become the largest terrestrial animals in Earth's history. As a part of this deep dive we've included an update on BHI 6248, E.D. Cope, the largest Tyrannosaurus ever discovered. " |
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