Tyrannosaurus rex (T.
rex) , the Tyrant Lizard King has long been thought of as the most terrifying dinosaur to ever roam the planet. Bipedal, 13ft tall (at the hips), 42ft in length, possessing a mouth full of teeth as long as 12 inches, and built like a classic
theropod, it's no wonder his discoverers thought him a king.
T. rex Skull

T. rex's reputation has wavered little even with the discovery of fellow theropods larger then the King, such as
Giganotosaurus and
Spinosaurus, although the latter's size is still up for debate. Even with larger rivals old Rexy is still regarded as the King of the dinosaurs amongst many, and it's a reputation well played out in movies such as
Jurassic Park.
Oddly despite being seemingly designed for to be a dinosaur hunting machine, some paleontologists believe T.
rex may have been nothing more then a scavenger, much like todays vultures, only on the ground with big...really big...um...teeth...Ok let's admit it, there is no way he was just strictly a scavenger. Odds are that like most predatory animals T. rex was an opportunistic hunter. That means that pretty much he would hunt for food, but if he found a fresh corpse or a weaker predators kill (even fellow Rexes probably) he wouldn't pass up the opportunity for an easy meal.
Now Tyrannosaurus had other family members running around the world before and during his reign. These family members have been given the convenient name of
Tyrannosauridae and they ranged over both North America and Asia. However in the last century an interesting report came out of Africa. It seems that in 1932 a man named John Johnson had a strange encounter in the Kasai Valley of what is now the
Democratic Republic of the Congo while hunting.
Mr. Johnson claimed that as he was about to shoot a rhinoceros when a 42ft long reptile burst out of the trees and killed John Johnson's would be trophy. His servant ran for his life while Mr. Johnson promptly fainted (If you believe that T.
rex's vision is based on movement like in Jurassic Park, it might work. However that bit of the movie was fictional...sorry to disappoint) only to come to later and see the creature chowing down on the rhino. John described the beast as looking like a Tyrannosaurus, as you probably already knew by now, which has since been labeled
Kasai rex.
The problem however is this; Tyrannosaurs (or Tyrannosauridae) did not roam Africa, or at least there is no fossil evidence that they did. Adding to this is the fact that there is absolutely no evidence of the creatures existence other then this account and a newspaper article describing a virtually similar incident without a name for the witness. There are also apparently two photos of said beast floating around out there, however one shows nothing more then a picture of a monitor lizard pasted onto a jungle scene and the other that supposedly shows a T.
rex eating a rhino doesn't seem to exist other then in a fake and copyrighted form.
The one in the second photo looks much like this one from an old movie.
It's posture is incorrect though. In fact T. rex stood much like the one in Jurassic Park.

If you don't want to dismiss Kasai
rex as nothing more then some hunters telling tall tales, you can assume that perhaps it was indeed an African dwelling theropod not related to Tyrannosaurus, such as
Cacharodontosaurus who was native at least to North Africa, and as large, if not larger then the King. Like all rumored surviving dinosaurs (excluding birds of course) it is doubtful that it exists at all, but as many like to say Africa would be one of the best places for one to survive if one did.
Sources and Further Reading:
Kasai Rex - Wikipedia
Kasai Rex - Some geocities site about why it's a hoax
Kasai Rex - True Authority (seems them creationists try and tote it around as evidence that they are right.)
Tyrannosaurus - Wikipedia