Video: Audobon's Birds of America

The books are huge -- bigger than a double page of newsprint. With maybe 60 copies in existence, they're worth about $11 million. And turning the pages is often a ritual that happens once a month or week. But now, the Academy of Natural Sciences has decided to turn the page of John James Audubon's famous book of bird paintings once a day in a public event.
Audobon's Birds of America

The books are huge -- bigger than a double page of newsprint. With maybe 60 copies in existence, they're worth about $11 million. And turning the pages is often a ritual that happens once a month or week. But now, the Academy of Natural Sciences has decided to turn the page of John James Audubon's famous book of bird paintings once a day in a public event.