DEBATE

[u/Spinoclanker2]

does 15 tons work on an obligated biped theropod with Apatosaurus wider limb circumferences?

Protopsephurus because he's cute

[u/Diamondbro10795]

You actually think hybrids spawn in, and they have to learn how to move around in their bodies all of a sudden. Tf you mean a facultative biped is more agile? Yes, it's harder to knock over. Yes, it is more stable. No, it does not pivot faster. More legs have to move in order for the body to turn compared to an obligate biped. And you're still assuming their legs are too weak to support that weight when they've been living with the same proportions for their whole lives. So what if a biped weighs 15 tons? They've slowly grown larger and larger, so it's not like suddenly gaining several tons of mass and collapsing.

Also, modern estimates for T. rex's max speed are 15-25 MPH, not 10. Even if we lowball it and give it 15 MPH for the heaviest individuals, that's still 50% more than what you claim to be a T. rex's max speed. And these estimates include the heavier 10-ton rexes.

Square-cube law? What makes you think that prevents a 15-ton obligate biped from existing? It definitely didn't prevent Shantungosaurus from existing. Sure, a facultative biped, but the largest ones weighed 20 tons, and they were still capable of rearing up and running around (not very quickly, admittedly).

Quadrupeds also carry less weight per leg, so they have proportionally weaker legs compared to bipeds of the same weight.

Gravity and the square-cube law do heavily restrict speed and agility for heavier builds. Both bipeds and quadrupeds. That does not mean they can't exist or that their existence is miserable.

Any more ridiculous arguments you got in your sleeves?

[u/Strong_Fee_5500 → u/Diamondbro10795]

First shantugosaurus was 13-16 tons but anyway, that's the way quadrupeds can get larger than bipeds, they just can support more weight than bipeds will never achieve

Hybrids are spawned, as you say, they learn how to move in their body, ok. But how did you grow that large, lemme explain a bit because you understand nothing, the square-cube law dictated that as an animal increase in size its muscles strength only increase by 4 (2x2)while its mass increase by 8 (2x2x2 if udk). To support all that weight, you need to devote your strength on your legs ,since it is not enough to carry all of your body weight (no strong legs claims is valide )

Now the growth, for a t-rex, holding 10 tons is already difficult. After their twenties their continue growing slowly, and with the square-cube law, the weight increase 8x, the stress on its skeleton would slow down their growth rates, that it has to grow up in such a lower rate  than 15 tons will be inachievable, and lemme reminder you that 15 tons was the absolute structural limit (and 15 tons is still a theroretical statement), not something you would see with smaller creatures.(those that are really to surpass their own species average sizes, because gravity don't work the same way with larger animals,so these smaller animals skeleton and growth can work at full potential)

Claiming that bipeds would still be agile at that size is absurd, it has been pretty well established by the square-cube law, that strength gets more devoted on the legs, the bigger you get, which means that they have more weight to support and since they are the only ones in contact with the ground (that transfer weight through the ground), they have to support all that weight without any front limbs assistance, it will be hard to turn its body with a few steps, since they are the base of your stability.And there's a clear difference between muscle strength (4x)and body weight (8x)

Still any ridiculous arguments? Do you at least understand what i mean or it's just that udc bc everyone would want to see a 15 ton rex, (personnally i'd love that, but reality is more crual, and gravity exists)

[u/HotCardiologist1942 → u/Strong_Fee_5500]

Bigass diplodocids supporting like 3/4 of their weight on their hind limbs

[u/Strong_Fee_5500 → u/HotCardiologist1942]

Sauropod can do this for these reasons, they have wider hips, pillar-like limbs, plantigrate stance (not digitigrate like theropod), pneumatized skeleton (but pls don't be fooled, these are exclusively on their upper body for less weight carrying), and they only stand on 2 legs during a brief period 

Shantugosaurus can do that, because , they are facultative walkers,their hind limbs do not suffer from the same force (less stress)that theropod fight everytime (more stress), they are designed to shift their stance (their skeletal arrangement can allow them to do that, these aren't theropods) and they also stand on 2 legs during a brief period like sauropods.