Dinosaurs? You got it.
The Bible does not mention dinosaurs, but it does mention serpents, dragons, and very large creatures of sea and sky. The word "behemoth" is mentioned a number of times. Some may believe that the large creatures are simply elephants or other fairly large animals, and if they believe that, fine.
I have also been presented with the possibility that dinosaurs were the "serpents" in the Garden of Eden story. So when God made the sinful creature crawl on its belly forever, the dinosaurs turned to snakes and therefore, dinosaurs became extinct. I dont know if I believe that or not- I havent given it much thought, but it is an interesting idea.
Creatures that sound very similar to dinosaurs are described in great detail in the Bible. Phrases such as "terrible teeth," "rows of scales," "flames out his mouth," "tail like a cedar," and "smoke out of his nose" sound like a dinosaur to me, but maybe I'm wrong. I wasnt there.