The reason the prehistoric creatures are not mentioned in the bible is that no one really knew that they ever existed; therefore how could anyone write about something they knew nothing about.
I'm not really a creationist, but I'll stand in their place for raising up some verses which would be seen by them as being dinosaurs:
Job 41 - The Leviathan (said by creationists to be a prehistoric marine reptile)
1 Can you pull in Leviathan with a fishhook
or tie down its tongue with a rope?
2 Can you put a cord through its nose
or pierce its jaw with a hook?
3 Will it keep begging you for mercy?
Will it speak to you with gentle words?
4 Will it make an agreement with you
for you to take it as your slave for life?
5 Can you make a pet of it like a bird
or put it on a leash for the young women in your house?
6 Will traders barter for it?
Will they divide it up among the merchants?
7 Can you fill its hide with harpoons
or its head with fishing spears?
8 If you lay a hand on it,
you will remember the struggle and never do it again!
9 Any hope of subduing it is false;
the mere sight of it is overpowering.
10 No one is fierce enough to rouse it.
Who then is able to stand against me?
11 Who has a claim against me that I must pay?
Everything under heaven belongs to me.
12 I will not fail to speak of Leviathans 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.
33 Nothing on earth is its equal
a creature without fear.
34 It looks down on all that are haughty;
it is king over all that are proud.
Job 40:15-24 - The behemoth (said by creationists to be some kind of large herbivore dinosaur because of the tail "like a cedar")
15 Look at Behemoth,
which I made along with you
and which feeds on grass like an ox.
16 What strength it has in its loins,
what power in the muscles of its belly!
17 Its tail sways like a cedar;
the sinews of its thighs are close-knit.
18 Its bones are tubes of bronze,
its limbs like rods of iron.
19 It ranks first among the works of God,
yet its Maker can approach it with his sword.
20 The hills bring it their produce,
and all the wild animals play nearby.
21 Under the lotus plants it lies,
hidden among the reeds in the marsh.
22 The lotuses conceal it in their shadow;
the poplars by the stream surround it.
23 A raging river does not alarm it;
it is secure, though the Jordan should surge against its mouth.
24 Can anyone capture it by the eyes,
or trap it and pierce its nose?
There ya go! So don't go telling creationists there ain't no dinosaurs in the Bible!