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Zoos across North America are moving their birds indoors as they try to protect them from the avian influenza. Nearly 23 million chickens and turkeys have already been killed across the United States to limit the spread of the virus. It would be especially upsetting for zoos to have to kill any of the endangered or threatened species in their care.

北美各地的动物园正在将它们的鸟类转移到室内，因为它们想要保护它们免受禽流感的影响。美国各地已经有近2300万只鸡和火鸡被杀，以限制病毒的传播。对于动物园来说，不得不杀死他们所照顾的任何濒危或受威胁的物种都会是特别令人不安的。