Did gladiators fight rhinos?
One thing that certainly did not happen was a warrior mounted on a rhinoceros (even a non-computer-generated one) charging at a group of gladiators. However, there is a record of a rhino at the inauguration of the Colosseum in 80BC. It didn’t fight men, but a bull, bear, buffalo, bison, lion and two steers. The other rare mentions of rhinos in Rome are of those in menageries, to be admired as exotic creatures.
This Roman interest in foreign, wild animals was the basis of the initial beast spectacles which began in 275BC with an exhibition of captured war elephants. Such non-violent displays of animals continued into the imperial era, but in 186BC the first staged animal hunt (venatio), featuring both lions and leopards, took place and by 169BC beast hunts had become an official part of republican state festivals.