How do hawks typically behave when suffering from aspergillosis?

When hawks are suffering from aspergillosis, they typically exhibit extreme lethargy. This disease, caused by a fungus, affects the respiratory system, which can lead to weakness and a lack of energy in the affected bird. Birds may not show their normal behavior and can appear more subdued and inactive due to the infection.

While behavioral changes can manifest in many ways, in the case of illness like aspergillosis, lethargy is a significant sign that indicates the bird's compromised health. The other behaviors listed, such as sudden tameness, aggression, or aggressive acts towards other birds, do not accurately reflect the typical response of a hawk dealing with this kind of health issue. Instead, the focus on lethargy points to the serious nature of the disease and the bird's decreased ability to engage in normal activities, highlighting the importance of vigilance in monitoring the health of birds in falconry.