Behemoth
Job 40:15-24 Revised Standard Version (RSV)
15 “Behold, Be′hemoth,[a]
which I made as I made you;
he eats grass like an ox.
16 Behold, his strength in his loins,
and his power in the muscles of his belly.
17 He makes his tail stiff like a cedar;
the sinews of his thighs are knit together.
18 His bones are tubes of bronze his limbs like bars of iron.
19 “He is the first of the works[b] of God;
let him who made him bring near his sword!
20 For the mountains yield food for him
where all the wild beasts play.
21 Under the lotus plants he lies,
in the covert of the reeds and in the marsh.
22 For his shade the lotus trees cover him;
the willows of the brook surround him.
23 Behold, if the river is turbulent he is not frightened;
he is confident though Jordan rushes against his mouth.
24 Can one take him with hooks,[c]
or pierce his nose with a snare?
The way the "behemoth" is described, doesn't it almost sound like a dinosaur? Perhaps one of the sauropods? Some will argue these verses are referring to the hippopotamus or elephant. However, they run into the problem of explaning vs 17, since the tails of both animals are...well, far from looking like a cedar tree (let along moving like one). Their tails more resemble switches.
Leviathan
Job 41:1-2 Revised Standard Version (RSV)
1 [a] “Can you draw out Levi′athan[b] with a fishhook,
or press down his tongue with a cord?
2 Can you put a rope in his nose,
or pierce his jaw with a hook?
Job 41:7 Revised Standard Version (RSV)
Can you fill his skin with harpoons,
or his head with fishing spears?
Job 41:12-32 NIV
12 “I will not fail to speak of Leviathan’s limbs, its strength and its graceful form. 13 Who can strip off its outer coat? Who can penetrate its double coat of armor ? 14 Who dares open the doors of its mouth, ringed about with fearsome teeth? 15 Its back has rows of shields tightly sealed together; 16 each is so close to the next that no air can pass between. 17 They are joined fast to one another; they cling together and cannot be parted. 18 Its snorting throws out flashes of light; its eyes are like the rays of dawn. 19 Flames stream from its mouth; sparks of fire shoot out. 20 Smoke pours from its nostrils as from a boiling pot over burning reeds. 21 Its breath sets coals ablaze, and flames dart from its mouth. 22 Strength resides in its neck; dismay goes before it. 23 The folds of its flesh are tightly joined; they are firm and immovable. 24 Its chest is hard as rock, hard as a lower millstone. 25 When it rises up, the mighty are terrified; they retreat before its thrashing. 26 The sword that reaches it has no effect, nor does the spear or the dart or the javelin. 27 Iron it treats like straw and bronze like rotten wood. 28 Arrows do not make it flee; slingstones are like chaff to it. 29 A club seems to it but a piece of straw; it laughs at the rattling of the lance. 30 Its undersides are jagged potsherds, leaving a trail in the mud like a threshing sledge. 31 It makes the depths churn like a boiling caldron and stirs up the sea like a pot of ointment. 32 It leaves a glistening wake behind it; one would think the deep had white hair.
Psalm 74:14 New International Version (NIV)
It was you who crushed the heads of Leviathan
and gave it as food to the creatures of the desert.
Psalm 104:25-26 Revised Standard Version (RSV)
Yonder is the sea, great and wide,
which teems with things innumerable,
living things both small and great.
There go the ships,
and Leviathan which thou didst form to sport in it.