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Size comparisons
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About the Artstation reconstruction, we must remember that there are using the estimation of up to 13.2 meters of Scott Harman about the largest Giganotosaurus specimen MUCPv-Ch1 and even Scott is no longer quite sure of the accuracy of that length:
 *This image is copyright of its original author  *This image is copyright of its original author So this image is presenting a very elongated Giganotosaurus that probably was not even near that long. The image of Carcharodontosaurus is too long with 13 meters and those legs seems to long too, but is still "cool" to see it there. Now, even with this "extra large" Giganotosaurus, we can see the diference in the body morphology between these two giants:  *This image is copyright of its original author  *This image is copyright of its original author  *This image is copyright of its original author Even with the extra length, Tyrannosaurus rex is obviosuly the heaviest of the two and the comparison of the heads shows how massive is the T. rex skull, it looks like that of a felid while that of Giga is more like a canid. 
Here's T rex vs some of North America's biggest sauropods. Looks like Rexy no longer holds the crown!
Holotype of Tyrannosaurus rex (CM 9380, 11.9 meters axial length, 7.5 tonnes), holotype of Sauroposeidon (OMNH 53062, 32 meters TL, 60 plus tonnes), BYU 9024 Barosaurus (50 meters TL, 100 tonnes), and OMNH 1670 Apatosaurus adult size (37 meters TL, 100 tonnes). Scalebar column is 1 meter each, skeletals by Hartman, Paleo King, Hartman, and Hartman.  *This image is copyright of its original author
Here's 2 of the beefiest giant sauropods in a size comparison.
Futalognkosaurus holotype (MUCPv-323, 27 meters TL, 60 tonnes) vs OMNH 1670 Apatosaurus (29.8 meters TL, 52 tonnes). Neither sauropod is full grown. Side views are by Paleo King and Scott Hartman respectively, top views by Paleo King and Greg Paul respectively. Left scalebars are 1 meter.  *This image is copyright of its original author
Here's an updated version of a previously posted size chart.
American mastodon vs Mapusaurus - average vs average and max vs max. On top is average vs average, with AMNH 9950 (289 cm shoulder height, 7.8 tonnes) and MCF-PVPH-108.169 (12.47 meters along the curves, 7 tonnes). Scalebar on lower right is 1 meter. On the bottom is 595BS71 (325 cm shoulder height, 11 tonnes) vs MCF-PVPH-108.145 (13.6 meters along the curves*, 8.5 tonnes). Scalebar on bottom left is 1 meter. American mastodon skeletals and top views are by Larramendi, while Mapusaurus skeletal and top view skulls are by Franoys and the rest of the Mapusaurus top view is scaled and modified from Bates Acrocanthosaurus. Size comparisons are not to scale with one another.  *This image is copyright of its original author *To those whom it may concern, I am well aware of MCF-PVPH-108.145's nature and that it could very well be different than what this chart depicts. This is just 1 estimation.
For those of you who like comparing FMNH PR 2081 vs MUCPv-Ch1, here's a comparison that goes the other way.
USNM 6183 (17 years of age, 99 cm femur, based on LACM 23845) vs MUCPv-95 (13.2 meters axial length, 8.6 tonnes). Skeletals by Franoys and GetAwayTrike.  *This image is copyright of its original author
@GuateGojira :
About #751 : very clear und striking your photos showing the comparaison between skelettons of Giganatosaurus, Carcharodontosaurus, Spinosaurus and T-Rex ! I just repeat the fact - stated on the link http://prehistoricbeastoftheweek.blogspo...-week.html - " Since then several other meat-eating dinosaurs have been discovered that rival or even surpass the tyrant king in length, but Tyrannosaurus was still the most robust and massive of all of them. ". And I would add "enjoying the most powerful bite force."  
Rishit Sheth
Blue Bull and Chital in Gir.  *This image is copyright of its original author
Mh Siddique
Malabar hornbill Flameback woodpecker Thattekad Kerala December 2019  *This image is copyright of its original author
Palaeoloxodon namadicus (500 cm SH, 22 tonnes) vs Dreadnoughtus (26 meters TL, 48.45 tonnes, still a juvenile).
Elephant side and top view are by Larramendi while Dreadnoughtus top view is by palaeozoologist and side is from the discovery paper.  *This image is copyright of its original author
Big male leopard and large hyena sharing a meal, this is what happens when large individuals of these two species meet.
Leopard was later chased away when another Hyena showed up.  *This image is copyright of its original author  *This image is copyright of its original author  *This image is copyright of its original author
Holotype of Tyrannosaurus rex (CM 9380, 11.9 meters axial length, 7 tonnes) vs holotype of Antarctosaurus giganteus (MLP 26-316, 235 cm femur, based on Futalognkosaurus, probably 80-100 tonnes?). In a similar vein to the Tyrannosaurus comparison on the top of this page (albeit reversed), just look at how much the titanosaur dwarfs the tyrannosaurid; the former isn't even a tenth as large. Skeletals are by Hartman (Tyrannosaurus) and SpinoInWonderland (Futalognkosaurus), top views based on Hutchinson 2011 and Paleo King.
 *This image is copyright of its original author
Horrible room of death but still interesting to see all these animals together
 *This image is copyright of its original author
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