The Nephilim created the dinosaurs by mixing bird, reptile and bovine DNA. It hints at this in The Book of Enoch

"And all the others together with them took unto themselves wives, and each chose for himself one, and they began to go in unto them and to defile themselves with them, and they taught them charms 2 and enchantments, and the cutting of roots, and made them acquainted with plants. And they 3 became pregnant, and they bare great giants, whose height was three thousand ells: Who consumed 4 all the acquisitions of men. And when men could no longer sustain them, the giants turned against 5 them and devoured mankind. And they [the giants] began to sin against birds, and beasts, and reptiles, and fish, and to devour one another's flesh, and drink the blood"

That passage is taken from the book of Noah and Enoch, and it is referring to a race of giants who began carrying out genetic experiments on animals. They began mixing the DNA of different species of animals and produced hybrid creatures which today we know as dinosaurs, but back then they labeled them dragons.

Some would be tempted to think that sin in that context means bestiality or eating animals. No. within the paragraph the word 'defile' is used to mean sex, and 'devour' clearly means eat. Sin therefore means something different. If you have done your research, it becomes highly evident what 'sinning against the animals. means. It means mixing the DNA of various sovereign species and creating abominations.

Today, science acknowledges that the T-Rex shares strong physiological similarities to a chicken and crocodile. Scientists have also discovered well preserved blood vessels and collagen fibers in a recovered T-rex fossil. How could both of these things be? Well first of all, the T-Rex came into existence when the Nephilim giants began mixing bird (chicken) DNA with that of a large crocodilian creature such as Sarcosuchus, and secondly, the blood vessels are preserved because the t-rex fossilized thousands of years ago in a great flood (not millions).

Now the Nephilim didn't just mix bird and reptile DNA, they also mixed bovine / caprine DNA and produced a horned dinosaur called 'carnotaurus'.

Look: [link to cloud-2.steampowered.com]

You can clearly see that the carnotaurus had goat-like features, so no doubt it resulted from the mixing of caprine / avian / reptilian DNA.

I'd also auggest that the nephilim went further and mixed their dna with animals, thus bringing forth a legion of strange humanoid creatures such as lizard men (reptoids), goat men, fish men, etc, but all likely perished in the flood which god sent to wipe out the giants and their creations.

Now is Satan not described as being dragon-like in appearance, as well as having goat-like horns (like the carnotaurus)? Could it be that the Nephilim also created Satan via genetic experimentation? Did they create him and all of the other genetically engineered 'demons' as servants, guardians, and a food source? The passage from Enoch says that the Nephilim required humans to sustain them, i.e., serve them and bring them food, but when they failed to do so, the Nephilim began eating humans.

In different texts from across the world we find the same basic story being told, yet some go further and state that humans fled from these tyrants and formed their own sub-culture elsewhere.

In Michael Tsarion's Atlantis book he says that this exodus prompted the Nephilim to genetically engineer new servants from animals, but Tsarion didn't realize that from these very genetic experiments the dinosaurs were also born.