Jess (falconry) chase something it shouldn't, and less to keep the bird from getting away, as falconry birds are routinely (and as part of the sport) set free—the bond between bird and falconer serves as a much better leash than any leather or rope ever will; however, it is not always desirable that a bird be able to take flight at its own whim, and both on the glove and on the perch, jesses help ensure this. During hunting season (small game season for North American falconers), jesses are generally worn all season in the mews, and are often removed for the
Falconry training and technique is illegal in the UK, as is releasing a captive bred bird. In America, trapping or attempting to trap any native species of raptor is a federal crime unless the person doing the trapping is licensed. A falconry permit allows a falconer to trap certain birds at certain times of the year. A falconry bird taken from the nest as a downy bird still unable to fly (a fledgling) is called an 'eyass' (by misdivision of French "un niais" from Latin "nidiscus", from Latin "nidus" = "nest"). In addition to wild-taken eyass hawks, all captive bred hawks taken at this