The temporary closures include the Forest Bird Trail, the African penguin exhibits in the Islands Pavilion, Steller’s Sea Eagle Aviary at Glacier Run and Lorikeet Landing in Australia. The zoo said the areas will remain closed for several weeks, until the threat has passed.

Zoo staff will monitor the animals in their care and wild birds on the grounds for signs of infection, while adjusting safety procedures as needed. Bird-care staff have added measures including disinfecting footwear before entering bird holding areas and increasing daily health checks and reporting.

Avian influenza is a viral disease that primarily affects wild and domestic birds and can sometimes spread to other animals. The Centers for Disease Control and Prevention says the risk to people is very low.