What function do Aylmeri bracelets serve?

Aylmeri bracelets, also known as Aylmeri jesses, are designed primarily to facilitate the tethering of a hawk. They help ensure that the bird can be safely and securely attached to a perch or leash without causing harm to its legs. This is crucial during training and while the bird is at rest or being handled, as it prevents the hawk from flying away unexpectedly while allowing the falconer to maintain control. The construction of these bracelets, which includes a combination of strong yet flexible materials, ensures that they are both effective and comfortable for the bird.

The other options do not accurately describe the primary function of Aylmeri bracelets. For instance, while managing feather growth and providing flexibility in the tarsi are important aspects of overall bird care, they are not the main purpose of these specific accessories. Therefore, the correct answer reflects the essential role of Aylmeri bracelets in safely securing and tethering the hawk during falconry activities.