As you all might had studied in Biology section of primordial first humans which evolved into the modern day man... The excavations of our past biologists suggested that there were cro-magnon man, neandertheal man, australopethicus, ramapethicus...primordial man homo sapien genus!( and also predator movie, who came first the developed man or the primordial in a ferrari?) So what i think is that what if dinasaur theory existence is fake?!!! What if the fossils of dinosaur considered were infact of reptilian mamalian of developed species of Cat itself!!! As the charles darwin theory suggests of animals developing through ages made significant changes for their survival. So the reptilian mammals who then might be of lizzard like crocodiles, alligators who then significantly developed into other sub-species of cat, dogs, tigers, wolf, leopards, lions! And herbivores like goats, deers, monkeys and buffalos! So the dinosaur might be just fossils of very similar to cat like serpents who were in the charles darwins developmental stage of reptilian egg layers to birth giving offspring feeding mammalian? Not like dinasaurs as depicted in movies and books!!! While the oldest surviving might be ostrich, kangaroo, girrafe and elephant!!! So their Dinosaur's DNA might be perfectly matching with cat itself!!! Then its just imaginations that there were various types of cat dinosaurs!