Ahh.. but they ARE mentioned.
"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 Bible uses ancient names like "behemoth" 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 .
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. 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!
From Are Dinosaurs In The Bible?
Maybe God was drunk waxing poetic at the time.
He ranks first among the works of God...
I guess He changed His mind ... I hope that doesn't happen often.
The problem is the majority of Dinosaurs weren't behemoths but human size or smaller so where are they listed in the Bible? Plus Dinos were a very diverse group with a Triceratops differing from a Tyrannosaurs equally if not more as much as a cow does from a lion so if they exsisted ancient people would have different names for them instead just groupping dinosaurs under the vague term of behemoth
Where are the Unicorns, cockatrices, And giant sons of God that go around inpregnating human females mentioned in the bible?