Canst thou draw out leviathan with an hook? or his tongue with a cord which thou lettest down? (Job 41:1, KJV)
Thou brakest the heads of leviathan in pieces, and gavest him to be meat to the people inhabiting the wilderness (Psalm 74:14)
Behold now behemoth, which I (God) made with thee; he eateth grass as an ox . . . Lo now, his strength is in his loins, and his force is in the navel of his belly (Job 40:15 - 16).
In that day the LORD with his sore and great and strong sword shall punish leviathan the piercing serpent . . . and he shall slay the dragon that is in the sea (Isaiah 27:1)
The behemoth is a creature God himself stated he made (Job 41:15). It eats grass and not meat (verses 15, 20) and is able to drink a remarkable amount of water (verse 23). Its size is huge (verse 23), having powerful legs and a belly (verse 16), and possessing bones so strong that they are likened to iron (verse 18). This beast also has a thick tail that it moves like a giant cedar (verse 17) and lives under shady trees (verse 21). The animal is so massive that no man can trap it (verse 24). Only God can overcome this exotic creature (verse 19).
Like the behemoth, the leviathan is one of the greatest creatures made by the hand of God (Job 41:33). This fearsome, powerful animal (verses 8 - 9) is said to have a large tongue (Job 41:1) and a thick, impenetrable skin composed of scales (verse 7, 13, 15 - 17, 23). It is said to be quite strong (verse 12), possessing two rows of teeth (verse 13) in a jaw that cannot be forced open (verse 14). This creature can look like it is breathing out fire and smoke (verses 19 - 21) and is unafraid of any man or any weapons used against it (verses 25 - 30, 33). In Psalm 74:12 - 14 this creature symbolizes Egypt, which God defeated in order to free his people. In Isaiah 26:21 - 27:1 it represents, in the end time, God's punishment for the world's sin and his judgment against evil.
Are they mythical?
Some commentaries are honest enough to admit that modern conclusions regarding these beasts may be nothing more than guesses. Adam Clarke, in writing about the Biblical reference to the behemoth, states the following.
"These, having been carefully considered and deeply investigated both by critics and naturalists, have led to the conclusion that either the elephant, or the hippopotamus or river-horse, is the animal in question . . . But even here there are still some difficulties, as there are some parts of the description which do not well suit even the hippopotamus . . . the animal here described is now extinct" (Adam Clarke's Commentary on Job 40:15).
Surprisingly, the Biblical descriptions of these two remarkable creatures better fits extinct dinosaurs than any other beast or mythical creature! Henry Morris writes the following in this regard.
"The description of behemoth seems to fit perfectly what we know about such a land dinosaur as apatosaurus, for example, and leviathan fits what we know about some large marine reptiles, such as the plesiosaur or ichthyosaur, for example . . .
"No man could trap this animal (in reference to the behemoth) . . . One should try to visualize the tail of an elephant or a hippopotamus as he reads this! And one should also visualize the mighty apatosaurus or tyrannosaurus or some other great terrestrial dinosaur. Every sentence is appropriate in describing such a huge dinosaur, but no other animal we are aware of, living or extinct, fits the bill." (The Biblical Basis for Modern Science, Chapter 12, section "Dragons and Unicorns")