Two Humboldt penguins at Alberta's Calgary Zoo died this week despite intensive care. Zoo veterinarian Doug Whiteside said initial necropsy results suggest the penguins died due to infection caused by Chlamydophila psittaci, bacteria implicated in outbreaks at other zoos and also found in wild birds. Although the diagnosis has not been confirmed, staff have begun treating the remaining birds with antibiotics. Dr. Whiteside thinks the penguins' immunity was compromised because they recently molted, a process that can cause physiological stress that predisposes them to illness.

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