What is a necessary feature of an outdoor hawking facility?

In the context of an outdoor hawking facility, having a covered perch is crucial for the well-being and safety of raptors. A covered perch provides shade and protection from adverse weather conditions such as rain, snow, and extreme sun, which are vital for maintaining the health and comfort of the birds. This feature helps prevent stress and ensures that the raptors can rest without being exposed to the elements, ultimately supporting their overall management and training.

The other features mentioned in the options do not adequately address the health and proper management needs of raptors in a hawking facility. For example, while some level of openness to the environment can be beneficial, it does not fulfill the specific necessity for shelter that a covered perch provides. In addition, allowing raptors to strike the enclosure sides could lead to injury, and while dimensions are important for space considerations, they do not specifically relate to the protective features needed for raptor welfare.