read job 40:15-24, notice how the behemoth is supposed to have a tail like a cedar, but the footnotes of your bible probably says it is a hippo or an elephant.

have you ever seen a cedar tree?

those things are enormous!

and have you ever seen a hippo or elephant's tail?

they are not so big.
if you Google sauropod you'll see how much the dinosaur has in common with the behemoth.
then look up job 41, the leviathan is supposed to be a crocodile, but how come it says that

'verse 18;his snorting throws out flashes of light,
his eyes are like rays of dawn.

verse 19; firebrands stream from his mouth;
sparks of fire shoot out

verse 20; smoke pours from his nostrils,
as from a boiling over a fire of reeds.'

and so on, then it says how he is so great that swords and spears have no effect on him and nobody dares approach him.

this surely could not be a crocodile, they have no fire and are often captured by natives in other countries.

this sounds like a fire breathing dinosaur,
and the tales of dragons probably come from this creature.