What is a primary symptom of aspergillosis in hawks?

Weight loss is a primary symptom of aspergillosis in hawks due to the underlying effects of this fungal infection. Aspergillosis is caused by the fungus Aspergillus, which can lead to respiratory issues in birds. When hawks become infected, they often experience difficulty breathing, decreased appetite, and overall weakness, which contribute to noticeable weight loss. The immune response to the infection can also divert energy from other bodily functions, exacerbating the loss of weight.

While excessive preening, feather discoloration, and swollen feet can occur in birds with various health issues, these symptoms are not as directly linked to aspergillosis as weight loss. Effective monitoring for weight changes in raptors is crucial, as it serves as a vital indicator of their overall health and well-being, particularly in the presence of diseases like aspergillosis.