What must a falconer pay special attention to when caring for an American Kestrel?

When caring for an American Kestrel, it is crucial to pay attention to all aspects mentioned in the options.

Weight management is vital for a kestrel's overall health and performance. An optimal weight ensures that the bird is fit for hunting and maintaining its energy levels. If a bird is underweight, it may not have the strength needed for flight or hunting, while being overweight can lead to health issues and lethargy.

In addition, attention to other avian predators is important. Kestrels, being small raptors, can fall prey to larger birds, such as hawks and owls. Therefore, a falconer must create a safe environment that protects the bird from potential attacks, especially during training sessions or while outdoors.

Moreover, injuries due to bating, which refers to the bird's instinct to flap its wings violently when startled, can lead to physical harm. Careful monitoring of the bird during these situations can help prevent injuries and ensure that the kestrel remains healthy and free from stress-related issues.

In conclusion, managing weight, ensuring protection from other predators, and preventing injuries during bating are all critical components of a falconer's responsibilities, thereby validating the choice that emphasizes the importance of all these factors.