Birds can spread the virus through droppings and nasal discharge. Experts say it can be spread through contaminated equipment, clothing, boots and vehicles carrying supplies.
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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, making it harder for the bird flu to reach them.
Penguins may be the only birds zoo visitors can see right now, because they are usually protected behind glass in their exhibits, making it harder to contract the bird flu.
Zoos across North America including the one in Des Moines are moving their birds indoors and away from people and wildlife as they try to protect them from the highly contagious and potentially deadly bird flu.