Which of the following is NOT a symptom of aspergillosis?

Aspergillosis is a fungal infection caused by the Aspergillus species, which can affect birds, particularly raptors in falconry. Symptoms commonly associated with this disease include weight loss, difficulty breathing, and behavioral changes that might indicate distress, such as sudden tameness.

The correct answer pertains to overeating. This is not a symptom of aspergillosis. In fact, affected birds often show decreased appetite and weight loss rather than an increase in food consumption. This reflects the health challenges faced by the birds as the fungal infection impacts their respiratory systems, leading to distress and a general decline in health. Far from overeating, birds with aspergillosis are more likely to exhibit signs of poor feeding behavior due to the physical discomfort caused by the illness.

In contrast, the other options represent recognized symptoms of the condition, which arise as the respiratory function diminishes and the birds undergo significant stress requiring them to adapt their behavior, sometimes appearing more tame as they become less active and more lethargic.