Dinosaurs offspring of demons?

Have there been respected theologians that offer the possibility that dinosaurs were on the earth at about the same time as Nephelim and were the offspring of demon angels defiling the other species and causing mutations in for example reptiles just as occured with the mutated Nephilim? One such theory I found intriguing is found at this link. http://the-end-time.blogspot.com/2010/08/genetic-modification-of-humans-animals.html?m=1