Zoos hiding birds as avian flu spreads in North America

Magellan penguins stand in their enclosure at the Blank Park Zoo (Charlie Neibergall/AP)

Zoos across North America are moving their birds indoors and away from people and wildlife as they try to protect them from the highly contagious and potentially deadly avian influenza.

Penguins may be the only birds visitors to many zoos can see right now because they already are kept inside and usually protected behind glass in their exhibits, making it harder for the bird flu to reach them.