Actually they are, it looks like you might have missed that one in your self discovery of the bible. Perhaps it is not always best to "figure things out for yourself."
Otherwise (In this case) you might miss the descriptions of the Leviathan of the deep or the Hebrew description of the tanniyn, "Giant dragon" or what it says about the behemoth in Job, such oversights leads one to think there is absolutely no account of such things in scripture.
How about the bible is not a science text book and was never intended to be taught from as a text book. Holy scripture is meant to establish the deity of God, establish the law and subsequently sin, and then show away for atonement for sin, or so says the word... Again when one wanders into scripture with "what he learns on his own" That person will be subject to his own "interpretations." Most of which will be derived from misconception.

Do we have documented and verified artifacts from specific individuals that prove everyone was from the time of Jesus? If we do have these items, Where are these artifacts housed? When where they found? Who found them? how do we know they belong to who you are claiming they belong to? If you can not show a pedigree of the artifacts in question, then how can you make such a claim?
Again in the end I am not represent new earth or an old earth creationism. I am simply stating that a measure of faith is used to accept any account of creation. From that point I can build a case as to the "personal preference' one exercises to believe what you want to believe, but other than that, i have nothing else to represent. I just don't want the self righteous to believe that they have something more real than anyone else. Because in the end none of us knows anything, we only have our faiths.
To which i would like to add, it is this "faith" and where we place it that is Judged. Because if all things are equal, why is it you believe what it is you believe?