We know now the word "Cryptozoology" which means "hidden animal study" has became more popular since its first appearance in print in 1959. The word "cryptid" was coined in 1983 by John E.Wall in the now defunct International Society of Cryptozoology. Cryptids are creatures presumed extinct, hypothetical species, or creatures known from anecedotal evidence or evidence insufficient to prove their existence.
There has been many books and documentaries made about the subject of cryptozoology. Most cryptozoology stories are about cryptids such as Bigfoot, Sasquatch, Yeti, Loch Ness Monster, Champ, Kraken, Thunderbirds just to name a few. But there are also cryptids that have been discovered that do exist such as Coelacanth, Okapi, Giant Squid, Komodo Dragon and many others.
But are there cryptids that are revealed in the Bible? The Bible describes many of these creatures. In the Bible, there is "behemoth", "leviathan", "satyr", "dragon", "unicorn", "fiery flying serpent", and many others.
In the book, "Biblical Cryptozoology : Revealed Cryptids of the Bible" (ISBN : 978-1-4415-2267-2)(amazon.com/books)(2009), there is chapters about each one of these creatures and the possibilities of what these creatures could be.
One such cryptid called "behemoth" (Job 40:15-24) was a creature revealed to Job by God when He said to Job, "Behold now behemoth, which I made with thee; he eateth grass as an ox" (Job 40:15). God wanted Job to see this magnificent creature that might be extinct now, but lived during the time of Job. The Book of Job is the only place where "behemoth" is mentioned in the Bible. This animal was revealed to Job because God wanted Job to see that this creature was "the chief of the ways of God" (Job 40:19). This creature had to be enormous because it had a tail that moved like a tall cedar tree in the wind. There is no animal that exists today that has a tail that large or that has bones like bars of iron. One possibility is that this creature could of been a dinosaur. Just go to a natural history museum near you and look at the enormous dinosaurs they have on display. Especially look at the tails and fossilized bones of a Diplodocus, Apatosaurus (formerly called Brontosaurus) or a Tyrannosaurus rex.
Behemoth, leviathan, satyrs, dragons, unicorns, and fiery flying serpents were real creatures because God cannot lie and that they were listed with other real creatures.