Use of a live-lure is necessary . . .

The use of a live-lure is viewed predominantly as a last-resort measure in falconry, primarily employed during emergencies. In standard practice, falconers generally use various methods and techniques to train and hunt with raptors without the need for live-lures. This method has ethical, legal, and practical implications that should be recognized.

While there may be specific situations where a live-lure could be justified, it is not the usual practice due to the complications it can introduce, such as the potential for harm to the lure, the raptor's hunting instincts, or the overall impact on local wildlife. Thus, the recommendation to resort to using live-lures only in emergencies acknowledges both responsible falconry practices and wildlife conservation considerations.

The other options imply a regular need or requirement for live-lures, which goes against the ethos of responsible falconry training and operation, emphasizing the importance of using trained food items or other methods instead.