Some think the behemoth and leviathan of Job may have been the hippopotamus and crocodile
However, when you read the description, those descritions seem to be reaching way too far. Men at the time did not fear any of those creatures the way the Behemoth and Leviathan are feared based on the descriptions.
Also, I raised a bit of a stir this last month in my church bible study. We were studying Job and It hit me as I read the thing from cover to cover: It reads like a parable. All the other books tie togehter. The characters are mentioned in other books, they string together, etc. But this book is completely self contained. The whole book is there solely for instruction to the reader, just like Jesus’ parables.
Just a thought.
The hyperbolic descriptions of the creatures could be a matter of perspective. Men who did not have sufficiently advanced technology (Job is believed to be the most anciently written book of the canon) wouldn’t be able to cope well with either a crocodile or a hippopotamus, and perhaps not even an elephant. Job himself and his family seemed to be agrarian and agrarians wouldn’t normally need to deal with elephants/hippos and crocodiles.