Yeah, but T-Rex can still smell just fine. T-Rex used both eyes and nose (contrary to what Jurassic Park claimed).
I was thinking piranha as well. But do they ever hunt alone? I thought they always attacked in schools (I concede that I could very well be wrong on this point).
What about a 1920’s style death ray?
I’ll take your Wolverine and raise you a Honey Badger . Though the X-man called Honey Badger has yet to make much of a name for herself 
I suddenly have this image of the new Deathrace 2050: A marathon with a T-Rex released, say, 40 minutes after the humans start running. You’ve heard of “march or die,” now it’s “run or die!”
“I don’t have to run faster than the T rex. I just have to run faster than you !”
With all due respect, the original strip used F-14s. The difference is technical, making this a nitpick.
Presumably the T-Rexes are using the super-long-range Phoenix missile system to compensate for their tiny arms?
Sailboat
Of course, if a Nazi is riding atop the T-Rex, I doubt any force could stop it.
mm
Silly. Gorillas don’t use rocket launchers!
Get a baboon.
As for the hippopotamus being an herbivore, I don’t think that’s an absolute. And they’re vicious animals. I think a T. Rex would probably learn to avoid them, or die.
Drop Bears! Drop Bears!
Well, if the sci fi channel is a reliable source, I would have to my money on Dinocroc, Frankenfish, or Chupacabra. I think any of them would be able to take on t-rex, but not Chuck Norris.
Yay for obscure references!
What about a T-rex with a ninja on its back and formula 409 in its hands?
ALLOWED? You mean they didn’t brush and floss?
Bob
After being at the top of the food chain for the last 65 million years, T-rex would have evolved in to an intellectual giant.
So we’d be facing a t-rex with rocket launchers.
<Nature Film voiceover> Here ve see an ant. Zis ant is engaged in a life or death schtruggle vith ze tyrannosaurus. You can see ze ant creeping up on ze tyrannosaurus on all zixes.
Now he stops to obserff. Zatisfied that ze tyrannosaurus has not heard him, he approaches nearer. Vith great skill he chooses his moment and zen, qvick as a limpet, vith one mighty bound buries his fangs in ze tyrannosaurus’s neck. Ze tyrannosaurus struggles to no avail. A battle of zis kind can take anything up to fifteen years because ze timber ant has such a tiny mouth.
Eh, I seriously doubt that old T Rex was fit to run a marathon. Over the super-long distances, men * tend to run down any other ambulatory species. There are exceptions, but they’re rare.
*Homo Sapiens, not me. I personally would be begging for the dinosaur to end the misery after not more than 300 yards.
Nope, after being at the top of the food chain for 65 million years the T-rex would still have a tiny brain. It’s being a tiny little ground-hugging shrewoid that gives you the stimulus to evolve intelligence; or being a frugivorous plains ape that’s not much better than a walking snack for the leopard population.
He could be bewildered by a bewilderbeast.
I’m going to posit that any of the recently extinct animals that were specifically made extinct by man out of fear, could have taken T-Rex. Simply because T-Rex would have been one of that group if he had lasted to human times.
I don’t think he’d have fared too well against a bunch of monkeys flinging feces at him and taunting him in monkey-talk.
But would the T-Rex have survived the French flinging cows at him? Either he gets pummeled or he bursts when engorged.
