I've heard some interesting theories.....
1: dinos were just really old large lizards. This theory suggests that lizards etc. just kept on growing as they got older and older, and since the climate and predator list was bilogically different than now, they had MUCH longer lifespans.
2: dinos were the result of human experimentation. this theory suggests that since men live to be up to 10 times as long as we do now, they were able to aquire a lot of knowledge. dinos were a result of mans crossbreeding or genetic alteration experiments, and as such were not saved with the other animals at the time of the flood.
Now these are just a couple of theories that I have heard in the past. No study have I done on these subjects. Thought I'd mention them however in case anyone wanted to discuss.
I'd do some more searching, but am pressed for time right now.
Interesting thread going here.
Here's an interesting link and to save you a mouse click some quotes....
http://www.christiananswers.net/dinosaurs/j-where2.html
Dinosaur-like creatures are mentioned in the Bible. The Bible uses ancient names like "behemoth" (beh-HEE-moth) and "tannin." Behemoth means kingly, gigantic beasts. Tannin is a term which includes dragon-like animals and the great sea creatures such as whales, giant squids, and marine reptiles like the plesiosaurs (PLEE-see-oh-sors) that may have become extinct (died out).
The Bible's best description of a dinosaur-like animal is in Job chapter 40...
"Look at the behemoth, which I made along with you and which feed on grass like an ox. What strength he has in his loins, what power in the muscles of his belly! His tail sways like a cedar; the sinews of his thighs are close-knit. His bones are tubes of bronze, his limbs like rods of iron. He ranks first among the works of God..."
-Job 40:15-19 (NIV)
The book of Job is very old, written after the worldwide flood of Noah's time and probably about 2,000 years before Jesus was born. Here God describes a great king of the land animals like some of the biggest dinosaurs, the Diplodocus and Apatosaurus. It was a gigantic plant-eater with great muscles and very strong bones. The long Diplodocus had leg bones so strong that he could have held three others on his back.
The behemoth were not afraid. They did not need to be; they were huge. Behemoth tails were so long and strong that God compared them to cedars--one of the largest and most spectacular trees of the ancient world.
After all the behemoth had died out, many people forgot about them. Dinosaurs were extinct and the fossil skeletons that are in museums today did not begin to be put together until about 150 years ago. Today, some people have mistakenly guessed that the behemoth mentioned in the Bible might be an elephant or a hippopotamus. But those animals do not have tails like the thick, tall trunks of cedar trees!
The "leviathan" the Bible talks about in Job 41 is described as the greatest creature in the sea. Unlike a crocodile or fish, it was useless to try to catch a leviathan with hooks, harpoons or anything else. "Nothing on earth is his equal--a creature without fear" (Job 41:33, NIV).
What was a leviathan? The large size, strong jaws, great teeth, fast swimming ability and it's protected back and underside all give clues. It could have been a Kronosaurus (KRON-oh-SOR-us) or something like it. This was one of the greatest, most overwhelming animals ever to swim the seas. It was not a true dinosaur, but it was reptile-like and had great, sharp teeth.
It seems these animals were still alive at the time of King David. Psalm 104 says they played where the ships go to and fro. This was probably the Mediterranean Sea.
It is interesting that many reports of "sea serpents" closely match the ancient pliosaurs and mosasaurs. They looked somewhat like huge lizards or crocodiles with flippers or webbed feet. Fossils show their backbones were very flexible. They could probably swim in a snake-like motion.
A creature very much like these was reported during World War I by a German submarine. Captain Georg von Forstner described what happened:
"On July 30, 1915, our U28 torpedoed the British steamer Iberian carrying a rich cargo in the North Atlantic. The steamer sank quickly, the bow sticking almost vertically into the air. When it had gone for about twenty-five seconds there was a violent explosion. A little later pieces of wreckage, and among them a gigantic sea animal (writhing and struggling wildly), was shot out of the water to a height of 60 to 100-feet. At that moment I had with me in the conning tower my officers of the watch, the chief engineer, the navigator, and the helmsman. Simultaneously we all drew one another's attention to this wonder of the seas...we were unable to identify it. We did not have time to take a photograph, for the animal sank out of sight after ten or fifteen seconds. It was about 60-feet long, was like a crocodile in shape and had four limbs with powerful webbed feet and a long tail tapering to a point."