Dinosaurs are from Mars

Dinosaurs are from MARS! They are the first aliens here on earth! They just never could figure the whole evolution thing out, and died out.  
     They are really weird like all those Roswell graphics you see around, and even GREEN. Some are no bigger than a parasite, while others could compete with the size of a large estate.
     They knew how to communicate, even if it was primitive. They’d claw into the ground an make their marks, only to be discovered light-years later.
     At the threat of extinction they migrated some returning to mars, where I believe they still exist to this day.