Why should hawks not be exposed to extended rains?

Hawks should not be exposed to extended rains primarily because it may chill and lower their resistance to several diseases. Prolonged exposure to wet and cold conditions can lead to a drop in body temperature, which stresses the bird and compromises its immune system. When a hawk’s body temperature is lowered, it becomes more susceptible to various illnesses, including respiratory infections and other stress-related diseases.

Staying dry is crucial for hawks, as their feathers are designed to repel moisture up to a certain point. However, when they are soaked for an extended period, the risk of chilling increases significantly. The heat loss can lead to hypothermia, especially if the bird isn't able to find adequate shelter or escape from the wet conditions. This is why managing a hawk's exposure to rain is vital for its health and wellbeing.

While other factors such as weakening of jesses, fading of feather color, or fungal infections can also be concerns, the immediate and serious threat posed by lowered resistance to disease due to chilling makes the latter the most critical reason to protect hawks from prolonged rains.