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Size comparisons
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Sea predators:
I put his information and images in the Megalodon topic, but I think that it will be interesting to place it here too. I was navigating in the web when I found the following comparative image:  *This image is copyright of its original author *This image is copyright of its original author Since the beggining I identified the source of the marine reptiles but the image of the orca, white shark and Livyatan is exagerated and that of Megalodon looks like the constant incorrect copy-paste of the white shark. So, I decided to make my own comparative image using the images from several artists and escalate them with the correct measurements available in litterature, here is the result:  *This image is copyright of its original author The image is self-explanatory, I quote the sources of each measurement that I used for all the beasts and I used the same grid for the uper images, each grid is 1 meter. Those from Randomdinos and Slate Weasel are they own escalations, so that is why you will see discrepancies between them for the same specimens. There are only two points that I will like to mention: 1 - The skull of the Tylosaurus "Bruce" is mentioned at 180 cm, but I remember (and I saw it in youtube just to confirm) that the skull was actually measured at about 190 cm (6 ft 23 in). So I don't know if Randomdinos used a paper to quote his size or maybe is because the skull was measured from its side and not from the middle of the skull. 2 - The holotype specimen for Shonisaurus sikanniensis was presented at 19.6 m by Randomdinos, but the paper of Nichols and Manabe (2004) says that the speciment measured 21 m, just like the webpage of the Royal Tyrrel Museum. So, for pure curiosity and used his image and escalated to the 21 m (in red) and there is no significant difference. There are many other comparative images in the web, but I an not sure of what sized they use and if the escalations are correct, so I suggest caution if you want to use them.  (01-23-2022, 02:25 AM)GuateGojira Wrote: There are many other comparative images in the web, but I an not sure of what sized they use and if the escalations are correct, so I suggest caution if you want to use them.Very nice work lad! Nice scaling and information as always but I'm pretty sure the Megalodon model wasn't based just on a scaled up version of the Great white shark, The silhouette of the giant shark is mostly based on this study here https://www.researchgate.net/publication...nstruction On which I based my latest size comparison, comparing the largest dimensions of Megalodon (20 meters) and Livyatan (17.5 meters) Additional note, the Livyatan model is an edited version made by Smilodon Maximus of the original model used in the very beautiful miniseries on Julian Johnson-mortimer yt channel that represent realistic interpretations of prehistoric animals *This image is copyright of its original author Also regarding the mass estimate, I'm pretty sure a 27-59 tons is a bit too low for a megalodon that large shown in your size chart, because a latest study gives a much bulkier bauplan for Megalodon https://www.palass.org/sites/default/files/media/progressive_palaeontology/2021/ProgPal2021%20Abstract%20Booklet.pdf Page 19 contains the dimensions and discussion where they conclude the mass of 61 tonnes for 15.93 metres. Now, isometric scaling to 20 meters would give over 120 tons and that's the reason why I don't always buy isometric scaling as it can give very inflated and exaggerated sizes and I also doubt a megalodon of max size grew anywhere close or over 100 tons, perhaps 70-80 tons shouldn't be that inaccurate but that's just guess estimate. Here's a Screenshots from the study of the estimated body mass of megalodon, what do you think about it? It'd be nice to know your opinion :) *This image is copyright of its original author
 (01-21-2022, 09:31 PM)LoveAnimals Wrote:(01-17-2022, 07:08 AM)JurassicDD Wrote: Scotty compared to Sue (skeletal by Randomdinos)My boy is enormous! Did you make the size comparison between Sue and him? Because visually seems you scaled Scotty higher than the 3.9 m measurement given by Dan Folkes. As far as I know Sue is 3.8 at the hip, and visually Scotty seems more than just 10 cm taller there (I may be wrong) I did not make it but if its scaled incorrectly i will remove it and hopefully someone can create a better version. (01-23-2022, 05:48 PM)LoveAnimals Wrote: Very nice work lad! Nice scaling and information as always but I'm pretty sure the Megalodon model wasn't based just on a scaled up version of the Great white shark, I read the study of Cooper et al. (2020) and is based mainly in sharks related with the great white, so there is no surprise that the results showed an oversized white shark, then that "new" image of Megalodon is again, unreliable. I saw even a video about this from Paleontologist Roberto Diaz Sibaja ("Palaeos" in FB and Youtube) where he mention this error. This is like if this people is trying to reconstruct a puma using for model a lion! Definitelly not the correct form and again we are runing in circles with these estimations. About the unpublished document of Cooper et al., if they continue using that overlarge white shark model, I am not surprised that they will get that big body mass. I will like to ask, why they don't use other body plan models if we already know that the white shark is not the correct one?
Ok, I made my own comparative image to check something here and I found something interesting:
 *This image is copyright of its original author I think that the model of Livyatan from "Smilodon Maximus" should have a slightly longer mouth, as we can see here, in that form it match the real skull of the cetacean. Please check that I did not use the last tip of the tail fluke to match the 17.5 meters, but the end of the last tail vertebrae. As this is especulative, I used the image from Jaime Bran to calculate it. Then we can see the Megalodon at 16 meters and at 20 meters (using the TLn form) with the bulky form. Now, I see that LoveAnimals is right, if the Megalodon of 16 meters would weight 60+ tonnes, then the bigger one should weight more. However, in the same token, I also see here that the weight of Livyatan shold be more too, as the smaller shark is already weighing over the 57 tonnes estimated by Villafaña et al. (2014). From my point of view, the two beasts are still about the same body mass, whatever this was. I made updates in the image in my previous post No. 1,322.
Check that I added an scale for easy comparison, also added the 20 m long Megalodon siluete for comparison purposese too and I added Orcinus citoniensis to the comparison.
Human and Cachalot Whale.
https://fhox.com.br/portfolio/animais/me...chalote-2/  *This image is copyright of its original author
The Beast of the Amazon.
Black Caiman and Tractor photos: Magdalena Noticias  *This image is copyright of its original author Black Caiman and Humans  *This image is copyright of its original author
Just a few updates.
First, the image of the large carnivoes of India, plus the sloth bear.  *This image is copyright of its original author Second, the image of the size of the largest tiger against the largest gaur, the best predator-prey match.  *This image is copyright of its original author Finally, a new image. I wanted to make a comparison to see how big is a large orca and while there are some images in the web I wanted to make one from my size and here it is:  *This image is copyright of its original author I took me a lot of time to found an image of a real orca in a side view and this was the best I could found. The skulls are from several populations, but the in the size side, there is already explained what info we have. I did not wanted to include the sizes of all orca populations because that was not my objective. I hope you like it.
Rio Negro - Aquidauana - Pantanal - Brazil
Left: 101 kg Mancha Preta male (captured by Onças Do Rio Negro Project) Right: Colombiano male (never captured but Mentioned by Onças Do Rio Negro Project to likely be near 150 kg, or 140ish kgs range)  *This image is copyright of its original author Colombiano was a Massive male. Video of the Fight.
Four cats of the genus Leopardus, from top to bottom:
 *This image is copyright of its original author These species lack a pair of chromosomes found in all other cats. (Anne-Sophie Betrand). Even among the small cat species, ear size and shape can vary considerably |
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