UFC legend Georges St-Pierre recently posted on social media about one of the most dangerous dinosaurs to have existed.St-Pierre got onto Instagram to repost a post from The Washington Post's climate coverage account regarding the Tyrannosaurus rex popularly known as T-Rex. It is a carnivorous dinosaur that has been widely represented in many forms of media, especially movies in the 'Jurassic World' franchise.'GSP' posted:"The best killing machine that ever lived just got more interesting 🧠 Credit: @washingtonpost / @postclimate"The post mentioned a fascinating new discovery about the creature:"The T. Rex may have been a lot smarter than we thought... The dinosaur's cerebrum contained enough neurons to solve problems and even form cultures, a new study found."Often associated with its ferocity and imposing physical features such as its large set of teeth, massive skull and powerful hind legs, the discovery of the T-Rex's mental capabilities gives it a newfound edge in its status as an apex predator.Check out Georges St-Pierre's post on the T-Rex below: View this post on Instagram Instagram PostFans react to Georges St-Pierre sharing newest discovery about dinosaursFans replied to Georges St-Pierre's Instagram post on the Tyrannosaurus rex with varied reactions.Fans raised questions about how the T-Rex weighed against 'GSP' himself and labeled the former two-division UFC champion as the "best killing machine.""But can trex beat GSP??""I think you've uploaded the wrong photo.. caption says the best killing machine that ever lived and its not a selfie 🤷‍♂️"Other fans questioned the legitimacy of the discovery while also debating the existence of dinosaurs in the first place."Question. How the f**k do we know…""If only they were real""Dinosaurs were invented by sir Richard Owen of the royal society. There has never been a complete dinosaur skeleton found. Look into the “bone wars”. It’s nonsense.""😂😂😂 Dinosaurs... people will believe anything.""What study? The "trust me bro" study?"One fan also made a humorous mixed martial arts reference by bringing into play the T-Rex's diminutive front limbs."Still couldn’t armbar any other dinosaurs with those tiny little arms though. It was smart enough to know how, but it just couldn’t pull it off 😂"Check out a screenshot compilation of the fans' comments below:Fans comment on Georges St-Pierre's post about dinosaurs [via Instagram @georgesstpierre]Check out further facts about the T-Rex in The Washington Post's Instagram post caption: View this post on Instagram Instagram Post