What is the best reason not to fly hawks during moult?

The best reason not to fly hawks during moult is that feather growth demands energy and hawks must be fed more than flying weight allows. During the moult, a hawk's body is focused on the energy-intensive process of growing new feathers. This period often requires a higher caloric intake than what the hawk typically needs when it is flying at its regular weight.

If a hawk is flown during moult, it may not have access to the extra nutrition necessary to support feather growth, which can leave the bird weak and vulnerable. Additionally, flying at a reduced energy level can impact a hawk’s overall health, stamina, and ability to perform effectively. Therefore, it is critical to ensure that during this time, the hawk receives adequate nutrition to facilitate feather regeneration, avoid stress, and maintain its well-being.

In contrast, the other reasons focus on immediate physical risks or environmental challenges associated with flying during moult, but do not encompass the broader physiological needs of the hawk that are compromised when not properly fed during this time.