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I'm not entirely sure but the manga came ages ago. It got more popular when the magi series did so an ova series was made then I guess they just decided to make a full series because of demand. I really liked the ova but you don't need to watch it really if you've seen the series, it doesn't have as much detail--Sorry if that's a terrible answer ~
I'm guessing you love dinosaurs? xD I love dinosaurs myself :D