What are field jesses primarily used for?

Field jesses are primarily designed to keep a raptor connected to the falconer's hand, preventing the bird from flying away when it's not intended to do so, especially during training or while being handled. These jesses are typically made of durable materials that provide security and control over the bird, allowing the falconer to maintain a safe and manageable connection with their raptor while in the field. This is crucial for both the safety of the bird and the falconer, as well as for effective training and handling practices.

The other options, while they may relate to aspects of falconry, do not accurately describe the primary function of field jesses. For instance, bird health assessments, feeding assistance, and species identification are important elements of falconry but are not the main purpose of jesses. The specific role of jesses is about physical control and connection, which is essential for the effective and responsible practice of falconry.