There is no such thing as dinosaurs, outside of complete fossils of birds and fish, and they aren't dinosaurs.
Dinosaurs are completely fake and absolutely gay. They didn't exist like Santa doesn't exist. They are a fable for the dumbest of us. Dumb people who like watching movies and going to theme parks and scaring little children. Dinos never existed at all. They were inserted to give credence to evolution. But that is a fail. Because this planet contains all life, mammals, reptiles, birds, fish, insects etc.
Dinosaurs that big destroy the flora and fauna, how then did they breathe without plants? A single Dino is eating millions and millions of tonnes of vegetation a week. Everytime it walks it creates earthquakes destroying trees and plants. Dinos hunting dinos, they'd carve out craters. Their bodies are disproportionate to their sizes. They are a freakshow where Frankenstein has combined varrying animal parts and assumed animal matter and sculpted out of paper mashie hideous creations, monsters. They are nothing more than the fiction of the depraved and absurd.
Stop being absurd and grow up. This planet is a perfectly balanced equation where life supports other life in absolute synchronisation, coexisting and balancing each other. Dinos are an imperfection like their stupid invasive creators, both are completely hostile to the natural environment. They don't coexist. But in order to cover up the fact they simply cannot be proved at all outside of a computer model and artist impressions, they were all wiped out, existing millions of years ago, covering up their lies and conjecture. Implanted through propaganda. Conjured from the depths of hyperbole and nonsensical imaginations for causing control and profit.
Sure there are extinct species. Megafauna; Mastodons etc. But almost all dinosaurs just aren't it.