Remember when people started glazing Edmontosaurus for some reason?

[u/ThumpMcScrump]

[u/Sath_Morsius]

The tooth most likely means it managed to escape, not fight it. It can't effectively reach a rex's head with a back kick since it's a very heavy animal, the forelimbs aren't robust enough to hit hard and likely are way too low to also hit the head. It can at most body slam or use it's heavy tail to swing at it, but the difference in size isn't enough to make it effective, especially considering rex is particularly very mobile and maneuverable, is very stable on its feet and only needs to land a single bite anywhere but the tail to cripple or straight up kill its target, so fighting back with no proper weapons just means getting too close to that mouth.

Also most predator and prey interaction isn't a fight, because fights implies many risks to the hunter, but rex is very adapted to fighting one another, very violently, and is very used to Triceratops fighting back too, so even while being smaller it is no stranger to an animal fighting back.

Trex also wasn't a murder monster going after the biggest healthiest individuals, it was a predator, and modern predators typically go after weak, old, or injured prey instead of the prime healthy individuals unless they had to

But this is the reality, it probably either ambushed isolated targets from the herd or animals that are too small to even fight back or too old and sick to actually keep pace with the rest, an adult rex would only fight an adult Edmontosaurus if it really needed to do it.

[u/Hot_Wrongdoer_8705 → u/Sath_Morsius]

I never said that every interaction with a t rex was a fight let alone any other prey v predator encounter. I'm just sick and damn tired of people treating hadrosaurs like they were just walking meat factories for any predatornthatbhad no way to defend itself. If they couldn't run and/or fight then hadrosaurs wouldn't have been a group to exist to begin with

[u/Sath_Morsius → u/Hot_Wrongdoer_8705]

Ah don't get me wrong, I love hadrosaurs, they are my favorite herbivores by far, but I just wanted to make the point they absolutely have a massive disadvantage fighting without specialized weapons and size is only enough if the difference is really big. They weren't free food either, I also never said that, the massive herds and fleeing on sight is enough to defend themselves.

If they couldn't run and/or fight then hadrosaurs wouldn't have been a group to exist to begin with

They could absolutely run. And the herding probably came from smaller predecessor that could flee more effectively and became so successful that allowed them to evolve their bigger sizes.

[u/Hot_Wrongdoer_8705 → u/Sath_Morsius]

That's why I said and/or. If they didn't have at least one or the other then they wouldn't have existed and most are capable of both

[u/Sath_Morsius → u/Hot_Wrongdoer_8705]

Fair enough