As far as why do animals die.... maybe it had something to do with that naughty SNAKE in the garden (bad snake, bad... bad... bad)
Whats even more interesting... is that the serpent is the symbol for Enki, also shown as the rod of Asclepius (Greek) and associated with medicine (Asclepius's son was the Greek god Apollo, a practitioner of medicine). Funny how the "serpent" ie Satan was made out to be the bad guy (from the Jewish standpoint - after all you don't want to piss off his younger brother Jehovah), when in fact he may have tried to save man, and been the originator of men and life (health, medicine, etc.).
Sounds like a smear campaign to me...