Hardly. Almost all carnivores are scavengers, you know. Facultative scavengers. Which means dead meat is a far easier meal than a living prey. But it also means they won't limit themselves to lie around waiting for something to drop dead. If they're hungry, they'll just get up and go kill something. Most modern superpredators act this way and there's no reason to believe something the size of a Tyrannosaurus would just use that sieze and other useful characteristics (binocular vision, for starters) just to act like a gigantic vulture. Plus, there's no irrefutable evidence that it did so. And, on the other side, we've got plenty of bones from hadrosaurids and ceratopsids that show healed bite marks that almost certainly came from tyrannosaurids. As stated by the man :devhodari-nundu: himself, dead animals don't heal.
I guess it makes sense then that during the 2 or 3 million years T-Rex was alive, there was no other large predator in the same time and place to fill the niche of the ACTUAL apex predator.
Terror birds practically didn´t have arms; neither did abelisaurs and neither do modern day birds of prey. Who needs arms when u can kill anything with your jaws? One bite and it's over. Screw arms. There's plenty of predators today who kill prey with their mouth alone (wolves, crocodiles, sharks, you name it), and none of them has such huge and powerful jaws as T.rex. As for leg structure, looks like that of a runner to me. Maybe not a cheetah-speedster, but fast nonetheless. And the eyes, they were actually huge; only small if you compare them with the size of the animal. The visual lobe on its brain was very well developed and it had binocular vision. Why is it so difficult to accept T. rex as a predator, I wonder?
The femur is longer than the tibia, so the T. rex can't run that fast. If you take a look at raptors' legs, it's the opposite. And if it were to run that fast and trip, it wouldn't be able to get back up because of its useless arms. The T. rex also had large olfactory bulbs and nerves, which would allow it to sniff out carcasses.
I'm not saying that it is definitely a scavenger, but this is absolutely debatable.
I suspect you have been reading books or papers by people like John Hutchinson or Jack Horner, who like to think that T. rex was too slow to hunt fast prey (or too slow to hunt, period). These are not very accurate authors, they make some very basic mistakes with dinosaur anatomy.......
Neither of them ever addressed the permanently flex-kneed leg design T .rex shares with all other predatory dinosaurs. Its knees were always designed for running, and its shin and metatarsals were long, providing extra speed. In fact most of bipedal animal's speed comes from the metatarsals, NOT the shin. And on T. rex they are huge. T. rex couldn't straighten its legs like an elephant even if it wanted to! It was permanently built for running. In fact the reduction of its arms also proves it was a runner - it needed smaller arms to reduce the weight in front of the hips as the head became bigger - that way it could keep balanced when chasing prey. In fact, T. rex was actually faster than Giganotosaurus (which is specialized in hunting sauropods). It had stronger leg bones for its mass, and longer legs in comparison to its body. It had to be faster - Triceratops was a fast runner and would flee rather than fight - Triceratops often show bite marks from T. rex on the hips, which means they were probably running away.
well they wouldn't have been able to fly if they didnt have any muscle at all. And i agree, they may not of, but some pterosaurus (e.g. like Quetzalcoatlus) even though they may look a little like unfed reptiles at times, did weigh a lot.