it's actually not a book in the strict sense. as happens with most 'sacred texts' it's a collection of old texts from different periods and different cultures mashed together. prophecies, legends, tales ... actually, there isn't even one bible but several, since different cults at different times found some pieces to support their particular beliefs better than others, and with presumably much being lost in translation.
these manipulations during the ages are a much more interesting 'study about human nature' than the tales themselves. plus it has the scientific and historiographic interest any other archaic cultural vestige has.
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now that i'm here, i'm currently reading 'the genius of birds' (
http://www.jenniferackermanauthor.com/genius-ofbirds/)
it's very interesting and it strikes me how little we actually knew about our feathery planetary companions until very little ago.