Two penguins at an aquarium showed respiratory problems and were suspected of having a serious fungal infection called aspergillosis. Doctors used CT scans to identify fluid in their air sacs and collected samples for testing. The tests showed the penguins did not have the fungal infection, so they did not need antifungal medications. Both penguins recovered naturally, demonstrating that combining imaging with fluid analysis can help identify the real cause of respiratory problems and avoid unnecessary medication.